---
id: CVE-2026-89762
title: >-
  kernel: apparmor: fix cred UAF caused by begin_current_label_crit_section()
  (CVE-2026-89762)
summary: >-
  A flaw was found in the Linux kernel's AppArmor security module. The
  begin_current_label_crit_section() function, used in various Linux Security
  Module (LSM) hooks, attempts to replace user credentials when a security label
  becomes stale. …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-825
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T11:39:48+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89762.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89762.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89762'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532435'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89762'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89762'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89762.mbox
  - url: 'https://git.kernel.org/stable/c/361488984d668235438faac28635f3632351407f'
  - url: 'https://git.kernel.org/stable/c/3f4ae5fab613dca01d6a2a8210dd832e009fcf47'
  - url: 'https://git.kernel.org/stable/c/580f777d6d9fd07fc034bd1aeba5c30fd48871a2'
  - url: 'https://git.kernel.org/stable/c/587a6a92b93ec314c583bbf747413af170d42540'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.0012
epssPercentile: 0.02061
scores:
  vendor: 5.2
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.472Z'
---

## Overview

A flaw was found in the Linux kernel's AppArmor security module. The begin_current_label_crit_section() function, used in various Linux Security Module (LSM) hooks, attempts to replace user credentials when a security label becomes stale. This process can lead to a Use-After-Free (UAF) vulnerability if the old credentials are still referenced or if the replacement occurs with overridden credentials. A local attacker could potentially exploit this flaw to achieve privilege escalation or cause a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89762.json)

**kernel: apparmor: fix cred UAF caused by begin_current_label_crit_section()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Not 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
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.