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VulnerabilityPublished

CVE-2026-64518: Linux kernel · tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key().

Affects Linux kernelSource GCVE Database

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Not known to be exploited · fixed in 6.12.5 : update Linux kernel when convenient.

Data as of 3 Nov 2026, 18:43 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
Patch
Available – fixed in 6.12.5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Linux LinuxAffected
  • =6.12.5
Fixed in–

AI-suggested

A fix is available in Linux kernel version 6.12.5, which removes the improper use of lockdep_sock_is_held() for TCP_TIME_WAIT sockets. Users and administrators should update to this or a later kernel version to remediate the vulnerability.

Description

A vulnerability in the Linux kernel's TCP implementation was fixed to prevent out-of-bounds access related to the twsk structure in the tcp_ao_established_key() function. The issue arises because lockdep_sock_is_held() was used incorrectly on a TCP_TIME_WAIT socket that lacks the sk_lock member, leading to invalid memory access.

References

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