Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup nfs40_clean_admin_revoked() takes a stateid reference under clp->cl_lock, drops nn->client_lock, and calls nfsd4_drop_revoked_stid(), which dereferences the stateid's client through s->sc_client->cl_lock. The stateid reference does not pin the client, so a teardown racing the dropped lock can free the client while nfsd4_drop_revoked_stid() is still using it. This cleanup runs from the laundromat, so a periodic sweep can race force_expire_client() driven by a write to the clients/<id>/ctl file. Skip a client that is already expiring and otherwise pin it with cl_rpc_users under client_lock before dropping the lock, matching nfsd4_revoke_states().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d688d8585e6bea5e4e37f7497feea93b6b0a469c to < 0ae0d2b5c5a1b39c0b3c15d96b32a5b0c583d519affectedd688d8585e6bea5e4e37f7497feea93b6b0a469c to < b413ec5b23e3445dc9c4f273116078e2d4747626affectedd688d8585e6bea5e4e37f7497feea93b6b0a469c to < 81cf7f1413862f87b078920c838460a6a88aa030affectedd688d8585e6bea5e4e37f7497feea93b6b0a469c to < 7b4f8a1586c42d3afc3c0ac779af2db7ab1a5c55affected
Linux Linux
Default version status: affected
6.9affected0 to < 6.9unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected