---
id: CVE-2026-68140
title: 'net/iucv: fix use-after-free of a severed iucv_path'
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 connect…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    5f08c5e50bcb4680069bd3f9edd5728308816ded
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    c24faf11bd31bfe0500aca12cbdd5a573a954a5d
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    99ddb33748698296a6f17b9b34aa3d16a406bb3c
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    23658b350b4107e8292045c2044983fd426fa15d
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    a5bbaddf69853117f28173c3f5c8fc14c6b2ec82
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    900cd6d8119b7f3ae5c4bf82f922ff5957df43db
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    f579582c03ed526281a8450159baf1d35099a85f
  - >-
    Linux >= f0703c80e5156406ad947cb67fe277725b48080f <
    be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a
  - Linux 2.6.24
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:44:34.964555Z'
published: '2026-08-10'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:52:59.281Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68140'
references:
  - url: 'https://git.kernel.org/stable/c/5f08c5e50bcb4680069bd3f9edd5728308816ded'
  - url: 'https://git.kernel.org/stable/c/c24faf11bd31bfe0500aca12cbdd5a573a954a5d'
  - url: 'https://git.kernel.org/stable/c/99ddb33748698296a6f17b9b34aa3d16a406bb3c'
  - url: 'https://git.kernel.org/stable/c/23658b350b4107e8292045c2044983fd426fa15d'
  - url: 'https://git.kernel.org/stable/c/a5bbaddf69853117f28173c3f5c8fc14c6b2ec82'
  - url: 'https://git.kernel.org/stable/c/900cd6d8119b7f3ae5c4bf82f922ff5957df43db'
  - url: 'https://git.kernel.org/stable/c/f579582c03ed526281a8450159baf1d35099a85f'
  - url: 'https://git.kernel.org/stable/c/be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a'
tags:
  - cve.org
epss: 0.00274
epssPercentile: 0.18458
ingestedAt: '2026-10-16T17:24:46.843Z'
---

## Overview

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

- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < 5f08c5e50bcb4680069bd3f9edd5728308816ded`
- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < c24faf11bd31bfe0500aca12cbdd5a573a954a5d`
- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < 99ddb33748698296a6f17b9b34aa3d16a406bb3c`
- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < 23658b350b4107e8292045c2044983fd426fa15d`
- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < a5bbaddf69853117f28173c3f5c8fc14c6b2ec82`
- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < 900cd6d8119b7f3ae5c4bf82f922ff5957df43db`
- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < f579582c03ed526281a8450159baf1d35099a85f`
- `Linux >= f0703c80e5156406ad947cb67fe277725b48080f < be7cc4656eb1f54029610e82d1f0fdd3f9b5ec0a`
- `Linux 2.6.24`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.