CVE-2026-89703 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in nfsd4_drop_revoked_stid due to missing SC_STATUS_FREED flag setting for admin-revoked delegations, letting attackers cause memory corruption, exploit requires local access.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.62% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Use After Free
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 with the fix applied.

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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