---
id: CVE-2026-64551
title: >-
  kernel: sctp: validate STALE_COOKIE cause length before reading staleness
  (CVE-2026-64551)
summary: >-
  A flaw was found in the Linux kernel's Stream Control Transmission Protocol
  (SCTP). This vulnerability allows a remote attacker or a local unprivileged
  user to potentially access and disclose sensitive information. By sending a
  malformed e…
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-125
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: '2026-07-27'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T11:18:40+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64551.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64551.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-64551'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507746'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-64551'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-64551'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026072737-CVE-2026-64551-1deb@gregkh/T
  - url: 'https://git.kernel.org/stable/c/6022da37786701df1fc5dd946a6dcba59d5473b1'
  - url: 'https://git.kernel.org/stable/c/861f884f5471632c731cbbd612a1c072e391a624'
  - url: 'https://git.kernel.org/stable/c/588706ebaf8cdb4a4161602949eba365514b1db1'
  - url: 'https://git.kernel.org/stable/c/a257b41ddfe9e327b26581ad2777f04b23ac73f5'
  - url: 'https://git.kernel.org/stable/c/08a8f2d13f703924316e9aeac863a88ef50990c7'
  - url: 'https://git.kernel.org/stable/c/ebe0a55d954fa8da383b6192edb8f763dcb002d5'
  - url: 'https://git.kernel.org/stable/c/bbd6b2ea966cf57b6ae095cf5a8dbc993cd197a0'
  - url: 'https://git.kernel.org/stable/c/1cd23ca80784223fa2204e16203f754da4e821f8'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00514
epssPercentile: 0.43611
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:42:25.961430Z'
scores:
  vendor: 7
  cna: 9.1
ingestedAt: '2026-10-16T17:24:46.833Z'
---

## Overview

A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP). This vulnerability allows a remote attacker or a local unprivileged user to potentially access and disclose sensitive information. By sending a malformed error message, the system can be tricked into reading and then leaking uninitialized memory, which is then sent back to the attacker.

## 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 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64551.json)

**kernel: sctp: validate STALE_COOKIE cause length before reading staleness** — rated Moderate by Red Hat. Released 2026-07-27, updated 2026-10-23.

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

## Remediation

Affected