CVE-2025-21795

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> NFSD: fix hang in nfsd4_shutdown_callback<br /> <br /> If nfs4_client is in courtesy state then there is no point to send<br /> the callback. This causes nfsd4_shutdown_callback to hang since<br /> cl_cb_inflight is not 0. This hang lasts about 15 minutes until TCP<br /> notifies NFSD that the connection was dropped.<br /> <br /> This patch modifies nfsd4_run_cb_work to skip the RPC call if<br /> nfs4_client is in courtesy state.