7.5 High

CVE-2025-21795 In the Linux kernel, the following vulnerability has been resolved: NFSD: fix hang in nfsd4_shutdown_callback If…

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.

Affected products and versions

Product	Affected versions	Fixed in
Linux 6.14	earliest → < 6.14	6.14
Linux 6.13	earliest → < 6.13.4	6.13.4
Linux 6.12	earliest → < 6.12.16	6.12.16
Linux 6.6	earliest → < 6.6.79	6.6.79
Linux 6.1	earliest → < 6.1.129	6.1.129
Linux	5.19	No fix stated
Linux 5.15	earliest → < 5.15.179	5.15.179
Linux 5.10	earliest → < 5.10.235	5.10.235
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated

Show the 3 other branches

Product	Affected versions	Fixed in
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem	Versions not published
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated