CVE-2026-68140
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
In the Linux kernel's net/iucv subsystem, there is a use-after-free vulnerability in handling severed iucv_path connections. The message_q queue holds raw pointers to the iucv_path, which is freed when the connection is severed, but notifications remain queued. Later recvmsg() uses the freed path, leading to a bug. The fix drops queued notifications when the path is severed.
Risk Assessment
This could lead to system crashes or potentially arbitrary code execution by an attacker controlling connection severance.
Recommendation
Install the Linux kernel update containing the fix and reboot the system.
Original NVD description (English source)
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.