---
id: CVE-2026-89671
title: 'kernel: nfsd: gate nfs3 setacl by argp->mask (CVE-2026-89671)'
summary: >-
  A flaw was found in the Linux kernel's Network File System version 3 (NFSv3)
  server daemon (`nfsd`). The `nfsd3_proc_setacl()` function unconditionally
  processes Access Control List (ACL) update requests, even when the client's
  request doe…
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-115
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: '2026-09-21T08:16:21+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89671.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89671.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89671'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532394'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89671'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89671'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89671.mbox
  - url: 'https://git.kernel.org/stable/c/3be1d8611dae4829e4608007db29f4a8748c37b2'
  - url: 'https://git.kernel.org/stable/c/68a80b26efdff1d09f8ae1773c6a915abb9e191d'
  - url: 'https://git.kernel.org/stable/c/b3bff820d068ea59767d4e91a3258231a879da5f'
  - url: 'https://git.kernel.org/stable/c/ff99ed007f065198fd723152405c22aa558f700b'
  - url: 'https://git.kernel.org/stable/c/453d7198a0ab07a12d46e0575861ac7b932da17e'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00487
epssPercentile: 0.41036
scores:
  vendor: 7
  cna: 9.1
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

A flaw was found in the Linux kernel's Network File System version 3 (NFSv3) server daemon (`nfsd`). The `nfsd3_proc_setacl()` function unconditionally processes Access Control List (ACL) update requests, even when the client's request does not specify an ACL to be set. A remote attacker could exploit this by sending a crafted `SETACL` request, leading to the unintended removal of a directory's default ACL or both access and default ACLs. This could result in unauthorized changes to file system permissions.

## 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-2026-89671.json)

**kernel: nfsd: gate nfs3 setacl by argp->mask** — 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