CVE-2026-89547 Linux Kernel - Broken Authentication

Linux kernel contains a broken authentication caused by unchecked percpu_counter allocation failure in SUNRPC svc pool initialization, letting local administrators cause memory corruption and kernel instability, exploit requires local admin privileges under memory pressure.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.56% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Authentication
Impact
Denial Of Service, Privilege Escalation
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 with the fix for SUNRPC percpu_counter allocation checks.

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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