NFSD: Handle layout stid in nfsd4_drop_revoked_stid()

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.

Timeline

1. Aug 15, 2026, 5:58 AM UTCCVE published
2. Oct 16, 2026, 6:53 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 16, 2026, 6:55 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 1e33e1414bec54a4feafa9e67e2617031be0afe2 · fixed in 7ed62f7040ee182cf7dea5798f9e114235b31dae; From 1e33e1414bec54a4feafa9e67e2617031be0afe2 · fixed in da6f86ff4f2dd490bea52419a49e19680efd5847; From 1e33e1414bec54a4feafa9e67e2617031be0afe2 · fixed in 8024028ef91616cf91cc669f2446a0406bc0ba19; From 1e33e1414bec54a4feafa9e67e2617031be0afe2 · fixed in 86b9898920a6d02b4149f4fef9efd77b8aa3b9ca

• Linux Linux

  6.9

• KernelLinux

  From 6.9.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 4