Vulnary
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Critical· 9.8official fix available

CVE-2026-89669

A critical flaw in the Linux kernel’s NFS server could let an attacker cause a use‑after‑free error, potentially leading to arbitrary code execution. The issue was fixed in a kernel update.

publishedSep 11, 2026
last modifiedSep 13, 2026
sourcesNVD
severity · cvss
9.8
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 users running NFS server components that have not yet applied the latest kernel update.

02

Real-world impact

An attacker could trigger the flaw to crash the NFS server or execute code with kernel privileges, compromising the entire system.

03

Why this severity

The CVSS score of 9.8 reflects the vulnerability’s high impact (confidentiality, integrity, availability) and the fact that it can be exploited remotely without authentication or user interaction.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade your Linux kernel to a version that includes the NFS server fix. The fix is part of the latest kernel releases.
  2. 02Reboot the system to load the updated kernel.

NVD-referenced vendor advisory

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 impactHigh
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 →