---
id: CVE-2026-89485
title: >-
  kernel: lockd: pin next file across nlm_inspect_file lock-drop
  (CVE-2026-89485)
summary: >-
  A flaw was found in the `lockd` component of the Linux kernel. This
  use-after-free vulnerability occurs in the `nlm_traverse_files()` function
  when a file's memory is prematurely released while an iterator still holds a
  pointer to it. A re…
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 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T21:23:38+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89485.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89485.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89485'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532183'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89485'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89485'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89485.mbox
  - url: 'https://git.kernel.org/stable/c/e3c413f789eaf0170275c7eba523ead73d963f30'
  - url: 'https://git.kernel.org/stable/c/08a455f87b14c7ff22ae3fdadda62a796a3a5572'
  - url: 'https://git.kernel.org/stable/c/550c19222c7132c888e23c9d89079ba1c9bc4cca'
  - url: 'https://git.kernel.org/stable/c/350087f231c11efcd288c310707c40eab63ca583'
  - url: 'https://git.kernel.org/stable/c/c24bdb7df2f34bdc38ca8a73796f5acb40f1830c'
  - url: 'https://git.kernel.org/stable/c/41f0a6d31615fcae261bf28a0aa50050dc93a401'
  - url: 'https://git.kernel.org/stable/c/e999a88133654c6dfc68487fb49da5f20dfa2d4f'
  - url: 'https://git.kernel.org/stable/c/526c49cff3f72c3ec74752016380c7567040581b'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00704
epssPercentile: 0.51903
scores:
  vendor: 7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in the `lockd` component of the Linux kernel. This use-after-free vulnerability occurs in the `nlm_traverse_files()` function when a file's memory is prematurely released while an iterator still holds a pointer to it. A remote attacker could potentially exploit this to cause system instability or a denial of service (DoS) by triggering a concurrent file release during a specific unlock window.

## Vendor advisories

- **Red Hat VEX** · Moderate · 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-2026-89485.json)

**kernel: lockd: pin next file across nlm_inspect_file lock-drop** — rated Moderate 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

Affected