CVE-2026-89682 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in nfsd due to a separately allocated fcache disposal structure being freed prematurely, letting attackers cause memory corruption, exploit requires triggering nfsd file disposal during net namespace teardown.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.53% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Remote Code Execution
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 containing the fix for fcache disposal UAF.

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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