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CVE-2026-68140

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From f0703c80e5156406ad947cb67fe277725b48080f · fixed in 5f08c5e50bcb4680069bd3f9edd5728308816ded; From f0703c80e5156406ad947cb67fe277725b48080f · fixed in c24faf11bd31bfe0500aca12cbdd5a573a954a5d; From f0703c80e5156406ad947cb67fe277725b48080f · fixed in 99ddb33748698296a6f17b9b34aa3d16a406bb3c; From f0703c80e5156406ad947cb67fe277725b48080f · fixed in 23658b350b4107e8292045c2044983fd426fa15d; From f0703c80e5156406ad947cb67fe277725b48080f · fixed in a5bbaddf69853117f28173c3f5c8fc14c6b2ec82; From f0703c80e5156406ad947cb67fe277725b48080f · fixed in 900cd6d8119b7f3ae5c4bf82f922ff5957df43db; From f0703c80e5156406ad947cb67fe277725b48080f · fixed in f579582c03ed526281a8450159baf1d35099a85f; From f0703c80e5156406ad947cb67fe277725b48080f · fixed in be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a

  • Linux Linux

    2.6.24

  • KernelLinux

    From 2.6.24 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8

git.kernel.org