---
id: CVE-2026-89697
title: >-
  kernel: nfsd: add fh_want_write() for early-verified SETATTR in
  nfsd_proc_setattr() (CVE-2026-89697)
summary: >-
  A flaw was found in the Linux kernel's Network File System Daemon (nfsd). When
  setting file attributes using `nfsd_proc_setattr()`, a specific code path
  (`BOTH_TIME_SET` branch) prematurely verifies file handles. This bypasses a
  critical w…
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-911
vendor: Red Hat
product: Red Hat Enterprise Linux 8
affected:
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T19:50:18+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89697.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89697.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89697'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532144'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89697'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89697'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89697.mbox
  - url: 'https://git.kernel.org/stable/c/3eec9d791968c177a4a8cda9af5c04f79dae09cb'
  - url: 'https://git.kernel.org/stable/c/9229d824b938f4fb0ea7a5dddade51735e6fe6f9'
  - url: 'https://git.kernel.org/stable/c/2150305134889fb2fc25228d35353bd2f6f29500'
  - url: 'https://git.kernel.org/stable/c/d823bf9285cdf4514873b85ab5a888878dd4e8f4'
  - url: 'https://git.kernel.org/stable/c/15ca3b64a69caa6194bed8f98a20ed90a11c11dd'
  - url: 'https://git.kernel.org/stable/c/533964d420d385e11b08dd4c56c66ef5dcccaf08'
  - url: 'https://git.kernel.org/stable/c/c4a409b86a92815181a8e9395c6bf1696ad19175'
  - url: 'https://git.kernel.org/stable/c/4e475be769aa9f7a2c1ce55a2b8592cfccacddcc'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00686
epssPercentile: 0.51225
scores:
  vendor: 7
  cna: 9.1
ingestedAt: '2026-09-14T15:23:07.449Z'
---

## Overview

A flaw was found in the Linux kernel's Network File System Daemon (nfsd). When setting file attributes using `nfsd_proc_setattr()`, a specific code path (`BOTH_TIME_SET` branch) prematurely verifies file handles. This bypasses a critical write verification step (`fh_want_write()`), allowing file attribute changes to proceed without a proper mount write reference. This could lead to unauthorized modification of file metadata or content, potentially impacting data integrity.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89697.json)

**kernel: nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

Not affected:

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

## Remediation

Out of support scope