CVE-2024-50154Network attack vector

Kernel memory corruption via request-socket timer race

Published Nov 7, 2024 · Updated Aug 5, 2026

A use-after-free in affected Linux TCP/DCCP request sockets allows remote attackers to corrupt kernel memory via crafted network packets. The timer_pending() check can miss del_timer_sync() after expire_timers() detaches the timer, leaving reqsk_timer_handler() to reuse req->sk after the socket closes. Reachability requires a listening socket, and the reported stale-pointer access requires a BPF program attached to trace_tcp_retransmit_synack, so most configurations are unaffected.

CVSS severity9.8
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A use-after-free in affected Linux TCP/DCCP request sockets allows remote attackers to corrupt kernel memory via crafted network packets. The timer_pending() check can miss del_timer_sync() after expire_timers() detaches the timer, leaving reqsk_timer_handler() to reuse req->sk after the socket closes. Reachability requires a listening socket, and the reported stale-pointer access requires a BPF program attached to trace_tcp_retransmit_synack, so most configurations are unaffected.

The record

CVE
CVE-2024-50154
Published
Nov 7, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.11 <4.2
  2. Affected versionversion=4.2
  3. Affected versionversion=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <106e457953315e476b3642ef24be25ed862aaba3
  4. Affected versionversion=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <5071beb59ee416e8ab456ac8647a4dabcda823b1
  5. Affected versionversion=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <51e34db64f4e43c7b055ccf881b7f3e0c31bb26d
  6. Affected versionversion=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <8459d61fbf24967839a70235165673148c7c7f17
  7. Affected versionversion=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <997ae8da14f1639ce6fb66a063dab54031cd61b3
  8. Affected versionversion=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <c964bf65f80a14288d767023a1b300b30f5b9cd0
  9. Affected versionversion=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <e8c526f2bdf1845bedaf6a478816a3d06fa78b8f
  10. Affected versionversion=d3a1196bfc462943694623412d8e03aaf172bdc1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.1.11 <4.2; version=4.2; version=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <106e457953315e476b3642ef24be25ed862aaba3; version=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <5071beb59ee416e8ab456ac8647a4dabcda823b1; version=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <51e34db64f4e43c7b055ccf881b7f3e0c31bb26d; version=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <8459d61fbf24967839a70235165673148c7c7f17; version=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <997ae8da14f1639ce6fb66a063dab54031cd61b3; version=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <c964bf65f80a14288d767023a1b300b30f5b9cd0; version=83fccfc3940c4a2db90fd7e7079f5b465cd8c6af <e8c526f2bdf1845bedaf6a478816a3d06fa78b8f; version=d3a1196bfc462943694623412d8e03aaf172bdc1

Published CVSS scores

9.8Linux kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0NISTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo