---
id: CVE-2026-74490
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tipc: avoid use-after-free in poll trace queue dumps

  TIPC socket tracepoints dump queue state through tipc_sk_dump()
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tipc: avoid use-after-free in poll trace queue dumps

  TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most
  queue-dump callsites already serialize that …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    ae7fc824970888b4fdaa076819c9a6f2fcede275
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    78706367fe1b98aee0a6de27c62b7f1e3035f38d
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    d7940bb6a8e7ab28f972c2875cb05783216312dc
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    bed792737b5f1ba773054dbe984502958bdfe6ce
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    ac2f787980fdf4364cd5651a4c8128e59b8de3aa
  - >-
    Linux >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779 <
    b4f1719dfea023220e0e6bd892b087d76b2a6a49
  - Linux 5.0
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:17:31.957'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74490'
references:
  - url: 'https://git.kernel.org/stable/c/3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/78706367fe1b98aee0a6de27c62b7f1e3035f38d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ac2f787980fdf4364cd5651a4c8128e59b8de3aa'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ae7fc824970888b4fdaa076819c9a6f2fcede275'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b4f1719dfea023220e0e6bd892b087d76b2a6a49'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bed792737b5f1ba773054dbe984502958bdfe6ce'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d7940bb6a8e7ab28f972c2875cb05783216312dc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00455
epssPercentile: 0.39352
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:58:05.163289Z'
ingestedAt: '2026-10-16T19:46:24.356Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

tipc: avoid use-after-free in poll trace queue dumps

TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most
queue-dump callsites already serialize that walk under the socket lock or
sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(...,
TIPC_DUMP_ALL, ...) without holding either lock.

That lets the poll trace path reach tipc_list_dump() and backlog head/tail
dumping while another context dequeues and frees an skb, leaving the trace
helper dereferencing a stale queue entry.

Stop the unlocked poll trace site from requesting queue dumps. Other queue
dump trace callsites keep their existing output under the locking they
already provide, while poll still emits the event itself without walking
live queue members from an unlocked context.

## Remediation

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