CVE-2026-64518
In the Linux kernel, the following vulnerability has been resolved: tcp: Fix out-of-bounds access for twsk in tcp_ao_established_key(). lockdep_sock_is_held() was added in tcp_ao_established_key() by the cited commit. It can be called from tcp_v[46]_timewait_ack() with twsk. Since it does not have sk->sk_lock, the lockdep annotation results in out-of-bound access. $ pahole -C tcp_timewait_sock vmlinux | grep size /* size: 288, cachelines: 5, members: 8 */ $ pahole -C sock vmlinux | grep sk_lock socket_lock_t sk_lock; /* 440 192 */ Let's not use lockdep_sock_is_held() for TCP_TIME_WAIT.
Affected versions
Linux kernel versions
6.12.5,
6.13
and later are affected. Fixed in
6.12.92,
6.18.34,
7.0.11,
7.1
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-64518?
CVE-2026-64518 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.12.5 onward and has been patched in 6.12.92, 6.18.34, 7.0.11 and others. CVE-2026-64518 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-64518?
Yes. CVE-2026-64518 has been patched. Fixed versions include 6.12.92, 6.18.34, 7.0.11 and others. If you are running Linux kernel 6.12.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-64518 actively exploited?
No. CVE-2026-64518 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.