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CVE-2026-68140

Unknown

Last modified

CVE-2026-68140 is a vulnerability of currently unknown severity. 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.

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 Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f0703c80e5156406ad947cb67fe277725b48080f, < 23658b350b4107e8292045c2044983fd426fa15d; >= f0703c80e5156406ad947cb67fe277725b48080f, < a5bbaddf69853117f28173c3f5c8fc14c6b2ec82; >= f0703c80e5156406ad947cb67fe277725b48080f, < 900cd6d8119b7f3ae5c4bf82f922ff5957df43db; >= f0703c80e5156406ad947cb67fe277725b48080f, < f579582c03ed526281a8450159baf1d35099a85f; >= f0703c80e5156406ad947cb67fe277725b48080f, < be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a
LinuxLinux2.6.24

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-68140?
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.
How severe is CVE-2026-68140?
Severity scoring for CVE-2026-68140 is pending analysis.
How do I fix CVE-2026-68140?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST