---
id: CVE-2026-89484
title: >-
  kernel: lockd: fix NULL dereference on lockowner allocation failure
  (CVE-2026-89484)
summary: >-
  A flaw was found in the Linux kernel's `lockd` component. This vulnerability
  occurs when the Network Lock Manager (NLM) client attempts to initialize file
  lock operations without successfully allocating a lockowner. This can lead to
  a NULL…
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-476
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T10:15:53+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89484.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89484.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89484'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532110'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89484'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89484'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89484.mbox
  - url: 'https://git.kernel.org/stable/c/07adfbb3de7529f58ca708a97ead7fa4fdb71056'
  - url: 'https://git.kernel.org/stable/c/4c7fc129db061c7daab841c4f3c342d894832362'
  - url: 'https://git.kernel.org/stable/c/51af080ca4e553256c59a75a877b9b4fff828311'
  - url: 'https://git.kernel.org/stable/c/d662f7fc04fde305a27f304b3cd19b614d366839'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.002
epssPercentile: 0.10107
ingestedAt: '2026-09-14T00:35:28.530Z'
---

## Overview

A flaw was found in the Linux kernel's `lockd` component. This vulnerability occurs when the Network Lock Manager (NLM) client attempts to initialize file lock operations without successfully allocating a lockowner. This can lead to a NULL pointer dereference during the release of the file lock, resulting in a system crash. An attacker could potentially exploit this to cause a denial of service.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, 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-2026-89484.json)

**kernel: lockd: fix NULL dereference on lockowner allocation failure** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

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

No fix planned:

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

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred