CVE-2026-89667 Linux Kernel - Race Condition

Linux kernel contains a race condition in nfsd filecache caused by improper synchronization of shrinker, GC worker, and fsnotify/lease callbacks with per-net shutdown, letting attackers cause resource leaks, exploit requires concurrent operations.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.54% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Race Condition
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for nfsd filecache race condition.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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