Detections
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CVE-2025-21795
medium
Description
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.
References
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://www.cisa.gov/news-events/ics-advisories/icsa-25-162-05
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://git.kernel.org/stable/c/efa8a261c575f816c7e79a87aeb3ef8a0bd6b221
https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d
https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854
https://git.kernel.org/stable/c/abed68027ea3ab893ac85cc46a00e2e64a324239
https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7
https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908
https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03
https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-5127
https://cert-portal.siemens.com/productcert/html/ssa-784472.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
https://cert-portal.siemens.com/productcert/html/ssa-265688.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html