---
id: CVE-2026-89684
title: 'kernel: nfsd: fix cpntf publish race in nfs4_init_cp_state (CVE-2026-89684)'
summary: >-
  A flaw was found in the Linux kernel's nfsd component. A remote attacker, by
  sending a specially crafted OFFLOAD_CANCEL request, could exploit a race
  condition during the initialization of copy state notifications. This could
  lead to a den…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-416
  - CWE-824
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: '2026-10-21'
sourceUpdated: '2026-10-21T10:02:11+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89684.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89684.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89684'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532088'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89684'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89684'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89684.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-89684'
  - url: 'https://git.kernel.org/stable/c/63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3'
  - url: 'https://git.kernel.org/stable/c/6ac469a274e3c7d87fc46ba46d83b95009680407'
  - url: 'https://git.kernel.org/stable/c/8eeca993357a0bc35aaefebfd7462ac7b0a21d9a'
  - url: 'https://git.kernel.org/stable/c/bfeac42d9074e539bacd1898dd8c14b7f5776620'
  - url: 'https://git.kernel.org/stable/c/21d6c5957f5ca97d7352e60f55ea412beb9419f5'
  - url: 'https://git.kernel.org/stable/c/a631a26a8777bb235eabd478bbbaf26a4db750bf'
  - url: 'https://git.kernel.org/stable/c/c7270f62e7a05a2ee68aa2b74262b658a14463bd'
  - url: 'https://git.kernel.org/stable/c/be3a5c1d857b0dcbc11796cea603ef25834f75b2'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00501
epssPercentile: 0.42714
scores:
  vendor: 7
  cna: 7.5
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

A flaw was found in the Linux kernel's nfsd component. A remote attacker, by sending a specially crafted OFFLOAD_CANCEL request, could exploit a race condition during the initialization of copy state notifications. This could lead to a denial of service (DoS) by causing the server to crash.

## 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 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89684.json)

**kernel: nfsd: fix cpntf publish race in nfs4_init_cp_state** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-10-21.

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

Workarounds / mitigations:

- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.