CVE-2026-89544 Linux Kernel SUNRPC - Use After Free

Linux kernel contains a use-after-free and refcount leak in SUNRPC gssx_dec_option_array caused by improper error path handling and memory management, letting attackers cause NULL dereference and memory corruption, exploit requires kernel-level access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.59% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Privilege Escalation
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 containing the fix for SUNRPC gssx_dec_option_array error path bugs.

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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