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CVE-2026-68140

HIGHCVSS 8.8/10EPSS 0.27%

Last modified

CVE-2026-68140 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.27%

19.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= f0703c80e5156406ad947cb67fe277725b48080f, < 5f08c5e50bcb4680069bd3f9edd5728308816ded; >= f0703c80e5156406ad947cb67fe277725b48080f, < c24faf11bd31bfe0500aca12cbdd5a573a954a5d; >= f0703c80e5156406ad947cb67fe277725b48080f, < 99ddb33748698296a6f17b9b34aa3d16a406bb3c; >= 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?
CVE-2026-68140 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
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