CVE-2026-68140net/iucv: fix use-after-free of a severed iucv_path

Official description

In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix use-after-free of a severed iucv_path af_iucv queues not-yet-received message notifications on iucv->message_q, each holding a raw pointer to the connection's iucv_path. When the peer severs the connection, iucv_sever_path() frees that path with iucv_path_free() but leaves the notifications queued. A later recvmsg() drains message_q via iucv_process_message_q() and hands the stale path to message_receive() -- a use-after-free of the freed iucv_path. Drop the queued notifications when the path is severed; once the path is gone they can no longer be received. This also frees the notifications leaked when a socket is closed with messages still queued.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5f08c5e50bcb4680069bd3f9edd5728308816ded
• https://git.kernel.org/stable/c/c24faf11bd31bfe0500aca12cbdd5a573a954a5d
• https://git.kernel.org/stable/c/99ddb33748698296a6f17b9b34aa3d16a406bb3c
• https://git.kernel.org/stable/c/23658b350b4107e8292045c2044983fd426fa15d
• https://git.kernel.org/stable/c/a5bbaddf69853117f28173c3f5c8fc14c6b2ec82
• https://git.kernel.org/stable/c/900cd6d8119b7f3ae5c4bf82f922ff5957df43db
• https://git.kernel.org/stable/c/f579582c03ed526281a8450159baf1d35099a85f
• https://git.kernel.org/stable/c/be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a