CVE-2026-89662 Linux Kernel NFSD - Use After Free

Linux kernel NFSD contains a use-after-free vulnerability caused by improper lock owner reference handling during client teardown in __destroy_client(), letting attackers cause NULL dereference and potential denial of service, exploit requires client teardown conditions.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.69% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
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.

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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