---
id: CVE-2026-72383
title: 'kernel: sctp: fix addr_wq_timer race in sctp_free_addr_wq() (CVE-2026-72383)'
summary: >-
  A flaw was found in the Linux kernel's Stream Control Transmission Protocol
  (SCTP) implementation. A race condition exists in the `sctp_free_addr_wq()`
  function during the cleanup of network address work queues. This allows a
  timer handler…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-416
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
published: '2026-08-15'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T09:38:28+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72383.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72383.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-72383'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2516354'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-72383'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72383'
  - url: 'https://kernelcve.org/list/?q=CVE-2026-72383'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026081518-CVE-2026-72383-bf62@gregkh/T
  - url: 'https://git.kernel.org/stable/c/5098308ad72f83f3b1a48c247dddab1695114bae'
  - url: 'https://git.kernel.org/stable/c/d49eff15261dd62e4fa3a316c26cb1f537a60464'
  - 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:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00163
epssPercentile: 0.05463
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:48:17.297535Z'
scores:
  vendor: 4.7
  cna: 7.8
ingestedAt: '2026-10-16T19:46:24.402Z'
---

## Overview

A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. A race condition exists in the `sctp_free_addr_wq()` function during the cleanup of network address work queues. This allows a timer handler to access memory that has already been freed, leading to a use-after-free vulnerability. Such a vulnerability can cause system instability, including crashes, and potentially lead to denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72383.json)

**kernel: sctp: fix addr_wq_timer race in sctp_free_addr_wq()** — rated Moderate by Red Hat. Released 2026-08-15, updated 2026-10-26.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9

## Remediation

Out of support scope

Workarounds / mitigations:

- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.