CVE-2026-89675 Linux kernel nfsd - Use After Free

Linux kernel nfsd contains a use-after-free vulnerability caused by race conditions in async copy cancel and shutdown operations, letting local attackers cause memory corruption or kernel crashes, exploit requires concurrent async copy operations.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.44% 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: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 async copy cancel and shutdown use-after-free.

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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