Out-of-bounds Write Affecting kernel6.18-tools-debuginfo package, versions <1:6.18.35-68.127.amzn2023
Threat Intelligence
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Test your applications- Snyk IDSNYK-AMZN2023-KERNEL618TOOLSDEBUGINFO-18905052
- published18 Aug 2026
- disclosed25 Jul 2026
Introduced: 25 Jul 2026
NewCVE-2026-64518 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel6.18-tools-debuginfo to version 1:6.18.35-68.127.amzn2023 or higher.
This issue was patched in ALAS2023-2026-1881.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel6.18-tools-debuginfo package and not the kernel6.18-tools-debuginfo package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
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.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-64518
- https://git.kernel.org/stable/c/03cb001ef87b3f8d859cf7f96329acf3d6235d29
- https://git.kernel.org/stable/c/29cf64d128c94cf98d1c69d8b2962d39db5ff4c6
- https://git.kernel.org/stable/c/510db031ba6eb40134f84c90ef963ea4b6dfb878
- https://git.kernel.org/stable/c/87bb3e719042f0030a6dad39118c6a6b2a491ad9