---
id: CVE-2026-89709
title: 'kernel: lockd, nfsd: RCU-protect nlmsvc_ops dispatch (CVE-2026-89709)'
summary: >-
  A flaw was found in the Linux kernel's lockd and nfsd components. An unguarded
  dereference of nlmsvc_ops after the nfsd module is removed can lead to a NULL
  pointer dereference or a use-after-free condition. This vulnerability could
  allow …
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-476
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
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T14:17:35+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89709'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532208'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89709'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89709'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89709.mbox
  - url: 'https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9'
  - url: 'https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.0033
epssPercentile: 0.26288
scores:
  vendor: 4.4
  cna: 8.1
ingestedAt: '2026-09-14T15:23:07.472Z'
---

## Overview

A flaw was found in the Linux kernel's lockd and nfsd components. An unguarded dereference of nlmsvc_ops after the nfsd module is removed can lead to a NULL pointer dereference or a use-after-free condition. This vulnerability could allow a local attacker to cause a denial of service.

## 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, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89709.json)

**kernel: lockd, nfsd: RCU-protect nlmsvc_ops dispatch** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.

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

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope