CVE-2026-89551 Linux Kernel - Integer Overflow

Linux kernel contains an integer underflow vulnerability in SUNRPC xdr_buf_trim function caused by improper clamping of buf->len during subtraction, letting attackers cause buffer length miscalculation, exploit requires crafted input triggering xdr_buf_trim.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.51% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Integer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/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 xdr_buf_trim underflow.

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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