CVE-2026-89686 Linux Kernel - Denial of Service

Linux kernel contains a race condition in nfsd4_alloc_layout_stateid caused by unsynchronized access to fi_deleg_file during delegation revoke, letting NFS clients trigger a kernel BUG, exploit requires concurrent NFS clients with delegation and recall.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.66% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
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

References

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