Expired Pointer Dereference Affecting perf6.18-debuginfo package, versions <1:6.18.38-73.137.amzn2023
Threat Intelligence
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Test your applications- Snyk IDSNYK-AMZN2023-PERF618DEBUGINFO-18528872
- published5 Aug 2026
- disclosed19 Jul 2026
Introduced: 19 Jul 2026
NewCVE-2026-53389 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 perf6.18-debuginfo to version 1:6.18.38-73.137.amzn2023 or higher.
This issue was patched in ALAS2023-2026-1969.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf6.18-debuginfo package and not the perf6.18-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:
net/tcp-ao: fix use-after-free of key in del_async path
In tcp_ao_delete_key(), the del_async path skips the current_key and rnext_key validity checks present in the synchronous path, assuming these pointers are always NULL on LISTEN sockets. However, if a key was added with set_current=1/set_rnext=1 while the socket was in CLOSE state, current_key and rnext_key will be non-NULL after listen() transitions the socket to LISTEN.
When such a key is deleted with del_async=1, hlist_del_rcu() and call_rcu() free the key without clearing the dangling pointers. After the RCU grace period, getsockopt(TCP_AO_INFO) dereferences current_key->sndid and rnext_key->rcvid from freed slab memory.
Clear current_key and rnext_key in the del_async path when they reference the key being deleted.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-53389
- https://git.kernel.org/stable/c/5ba9950bc9078e19b69cca1e56d1553b125c6857
- https://git.kernel.org/stable/c/6ce7ef41743740ce15c2061561b784148b565b3f
- https://git.kernel.org/stable/c/7ddc29a094d96e9b3aa280433c6dc443df9eabf2
- https://git.kernel.org/stable/c/e77fbefd1269b5c123e7c651a1ebdce1b87d19a0