CVE-2026-89669 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in nfsd4_copy_notify due to improper initialization and publication order of copy-notify stateid, letting remote attackers cause memory corruption via racing OFFLOAD_CANCEL, exploit requires crafted network requests.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
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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