---
id: CVE-2026-89477
title: >-
  kernel: sctp: fix NULL deref on untransmitted RECONF completion
  (CVE-2026-89477)
summary: >-
  A flaw was found in the Stream Control Transmission Protocol (SCTP)
  implementation within the Linux kernel. This vulnerability occurs when the
  kernel attempts to complete a stream reconfiguration request that has not been
  fully transmitted…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-476
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T08:40:21+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89477.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89477.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89477'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532238'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89477'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89477'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89477.mbox
  - url: 'https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75'
  - url: 'https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e'
  - url: 'https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df'
  - url: 'https://git.kernel.org/stable/c/b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4'
  - url: 'https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af'
  - url: 'https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66'
  - url: 'https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318'
  - url: 'https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00508
epssPercentile: 0.42373
scores:
  vendor: 7
  cna: 7.5
ingestedAt: '2026-09-14T15:23:07.453Z'
---

## Overview

A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. This vulnerability occurs when the kernel attempts to complete a stream reconfiguration request that has not been fully transmitted, leading to a null pointer dereference. An unprivileged local user or a remote attacker could exploit this by triggering specific stream reset or reconfiguration requests, causing the kernel to panic and resulting in a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89477.json)

**kernel: sctp: fix NULL deref on untransmitted RECONF completion** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7

## Remediation

Affected