---
id: CVE-2026-72383
title: 'sctp: fix addr_wq_timer race in sctp_free_addr_wq()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sctp: fix addr_wq_timer race in sctp_free_addr_wq()

  sctp_free_addr_wq() previously removed addr_wq_timer using timer_delete()
  while holding addr_wq_lock. However, time…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4db67e808640e3934d82ce61ee8e2e89fd877ba8 <
    a8323fb2ab6cd6978f359daeed6688e0cadf32ba
  - >-
    Linux >= 4db67e808640e3934d82ce61ee8e2e89fd877ba8 <
    c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1
  - >-
    Linux >= 4db67e808640e3934d82ce61ee8e2e89fd877ba8 <
    976c19de0f22a857ba0112f39635f8fd7a257568
  - Linux 3.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:48:17.297535Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:55:20.967Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72383'
references:
  - url: 'https://git.kernel.org/stable/c/a8323fb2ab6cd6978f359daeed6688e0cadf32ba'
  - url: 'https://git.kernel.org/stable/c/c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1'
  - url: 'https://git.kernel.org/stable/c/976c19de0f22a857ba0112f39635f8fd7a257568'
tags:
  - cve.org
epss: 0.00161
epssPercentile: 0.04907
ingestedAt: '2026-10-16T19:46:24.402Z'
---

## Overview

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

sctp: fix addr_wq_timer race in sctp_free_addr_wq()

sctp_free_addr_wq() previously removed addr_wq_timer using timer_delete()
while holding addr_wq_lock. However, timer_delete() does not guarantee that
a currently running timer handler has completed.

This allows a race with sctp_addr_wq_timeout_handler(), where the handler
may still run after addr_waitq has been freed, acquire addr_wq_lock, and
access freed memory, leading to a use-after-free.

Fix this by calling timer_shutdown_sync() before taking addr_wq_lock.  This
guarantees that any in-flight timer handler has finished and prevents the
timer from being re-armed during teardown, making subsequent cleanup safe.

## Affected

- `Linux >= 4db67e808640e3934d82ce61ee8e2e89fd877ba8 < a8323fb2ab6cd6978f359daeed6688e0cadf32ba`
- `Linux >= 4db67e808640e3934d82ce61ee8e2e89fd877ba8 < c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1`
- `Linux >= 4db67e808640e3934d82ce61ee8e2e89fd877ba8 < 976c19de0f22a857ba0112f39635f8fd7a257568`
- `Linux 3.7`

## Remediation

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