Vulnary
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Critical· 9.1official fix available

CVE-2026-89697

A critical flaw in the Linux kernel's NFS server could allow an attacker to compromise the integrity and availability of the system by manipulating file attributes without proper write permissions. The issue was fixed by adding a missing write reference check during attribute changes. The vulnerability is now patched in updated kernel releases.

publishedSep 11, 2026
last modifiedSep 13, 2026
sourcesNVD
severity · cvss
9.1
critical · how bad it is
exploitation · epss
<1%
10th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Oct 13, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

Linux kernel NFS server components; users running older kernel versions that lack the fh_want_write() fix.

02

Real-world impact

An attacker could modify or delete files on the NFS server, potentially causing data loss or corruption, and disrupt service availability.

03

Why this severity

The CVSS score of 9.1 reflects that the flaw can be exploited remotely without authentication, and it can lead to complete loss of integrity and availability of the affected system.

04

What to do about it

official fix available
recommended steps
  1. 01Update the Linux kernel to a version that includes the fix for CVE-2026-89697.

NVD description indicates the vulnerability has been resolved.

05

Timeline

  1. Sep 11, 2026 · 2d ago
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Sep 13, 2026 · 7h ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactNone
Integrity impactHigh
Availability impactHigh
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →