CVE-2026-89679 Linux Kernel - Denial of Service

Linux kernel contains a null pointer dereference in nfsd4_setattr caused by improper handling of special NFSv4 stateid in delegation timestamp attributes, letting remote NFSv4 clients cause kernel crash without authentication.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.72% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version with the fix for nfsd4_setattr null pointer dereference.

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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