---
id: CVE-2026-89491
title: >-
  kernel: ocfs2: cluster: don't sleep while holding o2hb_live_lock in
  o2hb_region_pin() (CVE-2026-89491)
summary: >-
  A flaw was found in the Linux kernel's ocfs2 cluster module. This
  vulnerability allows a local attacker to trigger a denial of service. The
  issue arises when a sleeping function is called while a spinlock is held
  within the o2hb_region_pin…
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-663
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    3b790774280a610f8bdbd5d4260a07345bcf8e04
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    0cbc2f20a6ea7b4a59efa9171b7c694cdd196507
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    c9be4de77f97f383b750698e1517fd296041f4bb
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    49002acc520c61002ad195894ac391c94317d3ba
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    ce035f208d68b812d83e5482980f2b1c88a9cd94
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    470212a5eefabcc16b8e2f7fe2844b8737fe571c
  - >-
    Linux >= 58a3158a5d17ddf4894db9e8ccaf92093ff8e42e <
    af09df89db9a68a1d76df0f75667998135bc8d65
  - Linux 2.6.38
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T12:46:23+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89491.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89491.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89491'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532444'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89491'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89491'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89491.mbox
  - url: 'https://git.kernel.org/stable/c/4d64f8da82fb9e8dbd5aa9b64c9bb6ac0decea03'
  - url: 'https://git.kernel.org/stable/c/3b790774280a610f8bdbd5d4260a07345bcf8e04'
  - url: 'https://git.kernel.org/stable/c/0cbc2f20a6ea7b4a59efa9171b7c694cdd196507'
  - url: 'https://git.kernel.org/stable/c/c9be4de77f97f383b750698e1517fd296041f4bb'
  - url: 'https://git.kernel.org/stable/c/49002acc520c61002ad195894ac391c94317d3ba'
  - url: 'https://git.kernel.org/stable/c/ce035f208d68b812d83e5482980f2b1c88a9cd94'
  - url: 'https://git.kernel.org/stable/c/470212a5eefabcc16b8e2f7fe2844b8737fe571c'
  - url: 'https://git.kernel.org/stable/c/af09df89db9a68a1d76df0f75667998135bc8d65'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.0021
epssPercentile: 0.11545
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in the Linux kernel's ocfs2 cluster module. This vulnerability allows a local attacker to trigger a denial of service. The issue arises when a sleeping function is called while a spinlock is held within the o2hb_region_pin() function, which can lead to a system crash or deadlock. This can result in the affected system becoming unresponsive.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89491.json)

**kernel: ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()** — 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.