---
id: CVE-2026-89675
title: 'kernel: nfsd: fix UAF in async copy cancel and shutdown (CVE-2026-89675)'
summary: >-
  A flaw was found in the Linux kernel's nfsd component. A race condition exists
  during asynchronous copy cancellation and shutdown operations, which can lead
  to a Use-After-Free (UAF) vulnerability. This allows an async copy object to
  be fr…
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 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T12:59:52+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89675.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89675.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89675'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532272'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89675'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89675'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89675.mbox
  - url: 'https://git.kernel.org/stable/c/62c0f6eaf050bb9284c1f9cac6ed1770092e6b95'
  - url: 'https://git.kernel.org/stable/c/9031493ef7369d5c59c4bacc96f0c85965f09a98'
  - url: 'https://git.kernel.org/stable/c/a385cf5e016b748babf94cc664e43a26e17db117'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00649
epssPercentile: 0.48885
scores:
  vendor: 6.4
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Linux kernel's nfsd component. A race condition exists during asynchronous copy cancellation and shutdown operations, which can lead to a Use-After-Free (UAF) vulnerability. This allows an async copy object to be freed or used after being freed, potentially causing memory corruption and system instability. This issue arises when a teardown caller races with the copy kernel thread, leading to incorrect memory management.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89675.json)

**kernel: nfsd: fix UAF in async copy cancel and shutdown** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-21.

Affected:

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

No fix planned:

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

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7

## Remediation

Affected