CVE-2026-53389

CVE CVE-2026-53389EUVD EUVD-2026-45511Published 2026-07-19T12:01:54.000ZLast changed 2026-08-05T12:35:29.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.12.95; patch: 7.1.3; d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 <e77fbefd1269b5c123e7c651a1ebdce1b87d19a0; d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 <6ce7ef41743740ce15c2061561b784148b565b3f; 6.7; patch: 7.2-rc1; patch: 0; d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 <7ddc29a094d96e9b3aa280433c6dc443df9eabf2; patch: 6.18.38; d6732b95b6fbbc6d5bb9d2f809e275763640c4a2 <5ba9950bc9078e19b69cca1e56d1553b125c6857

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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