The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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(). (CVE-2026-80521)

Note that Nessus relies on the presence of the package as reported by the vendor.

Detections

Analytics

Linux Distros Unpatched Vulnerability : CVE-2026-80521

high Nessus Plugin ID 340754

Version 1.15