Critical· 9.8official fix available
CVE-2026-89677
A flaw in the Linux kernel’s NFS server could let a malicious client cause the server to use the wrong directory entry, potentially leading to data corruption or unauthorized access.
publishedSep 11, 2026
last modifiedSep 13, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
6th 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 affected kernel versions, especially those using the NFS server.
02
Real-world impact
An attacker could cause the server to reference an incorrect directory entry, leading to data corruption, loss, or unauthorized access to files.
03
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is exploitable over the network with no authentication, and can compromise confidentiality, integrity, and availability.
04
What to do about it
official fix available
recommended steps
- 01Update the Linux kernel to a version that includes the fix for CVE-2026-89677.
- 02Reboot the system to load the new kernel.
NVD-referenced vendor advisory
05
Timeline
- Sep 11, 2026 · 2d agoPublishedDisclosed and added to the National Vulnerability Database.
- Sep 13, 2026 · 7h agoOfficial fix availableA 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
(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 →