---
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: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H'
cvssSource: vendor
cwe:
  - CWE-281
  - 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: '2026-10-25'
sourceUpdated: '2026-10-25T21:07:02+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://kernelcve.org/list/?q=CVE-2026-89671'
  - 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: 0.00501
epssPercentile: 0.42685
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T19:25:43.543380Z'
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 2026-10-25 · [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 2026-10-25.

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

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.