CVE-2025-21795

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

The following products are affected by CVE-2025-21795 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-21795.

URL	Resource
https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03
https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908
https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7
https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239
https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854
https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d
https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
https://lore.kernel.org/linux-cve-announce/2025022610-CVE-2025-21795-785d@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-21795
https://www.cve.org/CVERecord?id=CVE-2025-21795