CVE-2026-80521

CVE CVE-2026-80521EUVD EUVD-2026-66587Published 2026-08-26T14:37:02.000ZLast changed 2026-08-27T05:01:17.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: af_unix: Unlink scc_entry in unix_del_edge(). Kyle Zeng reported that GC could free a dead SCC partially. The scenario is as follows: 1) Create two SCCs: X -. A <-> B ^--' 2) Run the following concurrently: 2-1) send() sk-B to sk-B from sk-X 2-2) close() both A and B At 2-1), there is a small window where unix_add_edges() publishes a new edge (B <-> B) to GC but its skb is not queued by skb_queue_tail(). If 2-2) completes before skb_queue_tail() and GC is triggered, it judges A <-> B as dead, but B is not freed because GC cannot collect the not-yet-queued skb holding the B <-> B edge. X -. A <-> B -. This edge is visible ^--' ^..' but skb is not This itself is not a problem since the next GC run will judge B as dead as well and free it finally. X -. A <.> B -. ^--' ^--' However, X's SCC forces the next GC to call unix_walk_scc_fast(), and it iterates over A through B's scc_entry. Let's unlink scc_entry before freeing the vertex in unix_del_edge().

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: 7.1.10; 4090fa373f0e763c43610853d2774b5979915959 <594d905195024b228c962627ae5ae7c17bd582a4; patch: 7.2; de7921631ff323369aa63a4324695ab54ea4047e; 4090fa373f0e763c43610853d2774b5979915959 <e3702470ced94fad74d71e2232f022d2eb752a6d; 5dfd283f4651d04dbb70ceb9ae5c4a30eda3c52a; 6.10; 6.6.93 <6.7; 6.1.141 <6.2; patch: 0

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

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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