CVE-2026-89665 Linux Kernel - Improper Input Validation

Linux kernel contains a vulnerability in NFSv2 SETATTR/CREATE where out-of-range useconds values cause time value corruption due to integer overflow in sattr decoder, letting remote attackers cause improper time attribute handling, exploit requires crafted NFSv2 requests.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.62% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix for NFSv2 useconds validation.

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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