CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the Network File System (NFS) daemon, specifically allowing a use-after-free condition during export state revocation. This flaw can lead to a potential denial of service or arbitrary code execution if an administrator removes an export while a client is still accessing it, resulting in a race condition. System administrators managing NFS exports should prioritize this issue to mitigate the risk of exploitation in their environments.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during export state revocation nfsd4_revoke_export_states() has the same use-after-free as nfsd4_revoke_states(): it drops nn->client_lock across revoke_one_stid() and the following read of clp->cl_minorversion, but the stateid reference it holds does not pin the client. A teardown racing the dropped lock can free the client while revoke_one_stid() still dereferences it. exportfs -u drives this path through NFSD_CMD_UNLOCK_EXPORT, so an administrator removing an export can race a client expiry. 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().