CVE-2026-74316

Summary

In the Linux kernel, the following vulnerability has been resolved:

NFSD: Handle layout stid in nfsd4_drop_revoked_stid()

nfsd4_drop_revoked_stid() has no SC_TYPE_LAYOUT case, so when a client sends FREE_STATEID for an admin-revoked layout stid, the default branch releases cl_lock and returns without unhashing or releasing the stid. The stid remains in the IDR and on the per-client list until the client is destroyed.

Remove the layout stid from the per-client list and call nfs4_put_stid() to drop the creation reference. When the refcount reaches zero, nfsd4_free_layout_stateid() handles the remaining cleanup: cancelling the fence worker, removing from the per-file list, and freeing the slab object.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1e33e1414bec54a4feafa9e67e2617031be0afe2 < 7ed62f7040ee182cf7dea5798f9e114235b31daeaffected
LinuxLinux1e33e1414bec54a4feafa9e67e2617031be0afe2 < da6f86ff4f2dd490bea52419a49e19680efd5847affected
LinuxLinux1e33e1414bec54a4feafa9e67e2617031be0afe2 < 8024028ef91616cf91cc669f2446a0406bc0ba19affected
LinuxLinux1e33e1414bec54a4feafa9e67e2617031be0afe2 < 86b9898920a6d02b4149f4fef9efd77b8aa3b9caaffected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References