---
id: CVE-2026-89479
title: >-
  kernel: sctp: stop processing a packet once its association is deleted
  (CVE-2026-89479)
summary: >-
  A flaw was found in the Linux kernel's Stream Control Transmission Protocol
  (SCTP) implementation. A remote attacker could send a specially crafted series
  of SCTP packets, leading to a use-after-free vulnerability. This occurs when
  the ker…
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-825
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 9
  - openshift_container_platform 4
  - enterprise_linux 6
  - enterprise_linux_baseos_v_8
  - enterprise_linux_crb_v_8
  - enterprise_linux_nfv_v_8
  - enterprise_linux_rt_v_8
patched:
  - enterprise_linux_baseos_v_8
  - enterprise_linux_crb_v_8
  - enterprise_linux_nfv_v_8
  - enterprise_linux_rt_v_8
published: '2026-09-11'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T04:32:41+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89479.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89479.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89479'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532290'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89479'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89479'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89479.mbox
  - url: 'https://access.redhat.com/errata/RHSA-2026:85773'
  - url: 'https://access.redhat.com/errata/RHSA-2026:85774'
  - url: 'https://git.kernel.org/stable/c/7d970353eeb98f46a3b9dc602850e4f6336a9889'
  - url: 'https://git.kernel.org/stable/c/09c3b193a3e8fe53e1f416e2f8e3283d2a785405'
  - url: 'https://git.kernel.org/stable/c/ed85fe91a61bc0e0da6b585c07102b20f4cc65a0'
  - url: 'https://git.kernel.org/stable/c/5c0b2dbbdafc9eeeb11fffe1e46551fc3b55d8ee'
  - url: 'https://git.kernel.org/stable/c/ee3f04cf566f6041aa9a0360494fd8db5ade383a'
  - url: 'https://git.kernel.org/stable/c/fa306a40e716c5abcd967475459ce1ebd56e5115'
  - url: 'https://git.kernel.org/stable/c/a713e1b3a265f180ad25a08e17be15d67a2f7149'
  - url: 'https://git.kernel.org/stable/c/47e15a8d12e366d0d261bcbc394394f44418938d'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.005
epssPercentile: 0.42614
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T19:22:28.838638Z'
scores:
  vendor: 7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.453Z'
---

## Overview

A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. A remote attacker could send a specially crafted series of SCTP packets, leading to a use-after-free vulnerability. This occurs when the kernel attempts to access memory that has already been deallocated, which could result in a denial of service.

## Vendor advisories

- **RHSA-2026:85773** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85773)
- **RHSA-2026:85774** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85774)
- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89479.json)

**kernel: sctp: stop processing a packet once its association is deleted** — rated Important by Red Hat. Released 2026-09-11, updated 2026-10-20.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
- Red Hat Enterprise Linux 6

Fixed:

- Red Hat Enterprise Linux BaseOS (v. 8)
- Red Hat Enterprise Linux CRB (v. 8)
- Red Hat Enterprise Linux NFV (v. 8)
- Red Hat Enterprise Linux RT (v. 8)

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:85773
For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associa… https://access.redhat.com/errata/RHSA-2026:85774