---
id: CVE-2026-89658
title: >-
  kernel: NFSD: Prevent client use-after-free during NFSv4.0 revoked-state
  cleanup (CVE-2026-89658)
summary: >-
  A flaw was found in the Linux kernel's Network File System Daemon (NFSD).
  During NFSv4.0 revoked-state cleanup, a race condition can occur where a
  client's state identifier (stateid) reference does not properly prevent the
  client from bein…
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 6
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T18:29:44+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89658.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89658.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89658'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532130'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89658'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89658'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89658.mbox
  - url: 'https://git.kernel.org/stable/c/0ae0d2b5c5a1b39c0b3c15d96b32a5b0c583d519'
  - url: 'https://git.kernel.org/stable/c/7b4f8a1586c42d3afc3c0ac779af2db7ab1a5c55'
  - url: 'https://git.kernel.org/stable/c/81cf7f1413862f87b078920c838460a6a88aa030'
  - url: 'https://git.kernel.org/stable/c/b413ec5b23e3445dc9c4f273116078e2d4747626'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00608
epssPercentile: 0.47808
scores:
  vendor: 4.4
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Linux kernel's Network File System Daemon (NFSD). During NFSv4.0 revoked-state cleanup, a race condition can occur where a client's state identifier (stateid) reference does not properly prevent the client from being prematurely freed while still in use. This use-after-free vulnerability could allow a remote attacker to cause a denial of service (DoS) or potentially execute arbitrary code on the affected system.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, 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 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89658.json)

**kernel: NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

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

Not affected:

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

## Remediation

Out of support scope