---
id: CVE-2026-89697
title: 'nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()

  The BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare()
  can inspect the dentr…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-911
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    3eec9d791968c177a4a8cda9af5c04f79dae09cb
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    9229d824b938f4fb0ea7a5dddade51735e6fe6f9
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    2150305134889fb2fc25228d35353bd2f6f29500
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    d823bf9285cdf4514873b85ab5a888878dd4e8f4
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    15ca3b64a69caa6194bed8f98a20ed90a11c11dd
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    533964d420d385e11b08dd4c56c66ef5dcccaf08
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    c4a409b86a92815181a8e9395c6bf1696ad19175
  - >-
    Linux >= cc265089ce1b176dde963c74b53593446ee7f99a <
    4e475be769aa9f7a2c1ce55a2b8592cfccacddcc
  - Linux 1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8
  - Linux >= 3.18.46 < 3.19
  - Linux 4.2
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T19:26:07.202992Z'
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:51:10.455Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89697'
references:
  - 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'
  - 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
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00696
epssPercentile: 0.52817
scores:
  cna: 9.1
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.449Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()

The BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare()
can inspect the dentry. This causes nfsd_setattr() to skip
fh_want_write(), so notify_change() runs without a mount write
reference.

Add the missing fh_want_write() call after the early fh_verify().

## Affected

- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < 3eec9d791968c177a4a8cda9af5c04f79dae09cb`
- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < 9229d824b938f4fb0ea7a5dddade51735e6fe6f9`
- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < 2150305134889fb2fc25228d35353bd2f6f29500`
- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < d823bf9285cdf4514873b85ab5a888878dd4e8f4`
- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < 15ca3b64a69caa6194bed8f98a20ed90a11c11dd`
- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < 533964d420d385e11b08dd4c56c66ef5dcccaf08`
- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < c4a409b86a92815181a8e9395c6bf1696ad19175`
- `Linux >= cc265089ce1b176dde963c74b53593446ee7f99a < 4e475be769aa9f7a2c1ce55a2b8592cfccacddcc`
- `Linux 1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8`
- `Linux >= 3.18.46 < 3.19`
- `Linux 4.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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)