CVE-2026-89537 Linux Kernel - Buffer Over-read

Linux kernel contains a buffer over-read vulnerability in SUNRPC gss_krb5_verify_mic_v2 caused by missing length checks on short RFC 4121 MIC tokens, letting malicious NFS servers cause out-of-bounds reads, exploit requires malicious NFS server.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.54% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Over-read
Impact
Information Disclosure, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for SUNRPC gss_krb5_verify_mic_v2.

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

← All CVEs