CVE-2025-21795Medium· 5.5▾ SunlitIn 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 …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 14.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
0.2% → 0.6%
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.
linux_kernel >= 5.10.220, < 5.10.235linux_kernel >= 5.15.154, < 5.15.179linux_kernel >= 5.19, < 6.1.129linux_kernel >= 6.2, < 6.6.79linux_kernel >= 6.7, < 6.12.16linux_kernel >= 6.13, < 6.13.4linux_kernel = 6.14Upgrade past the affected range:
linux_kernel 6.13.4Connected by shared product, vendor, weakness, or advisory.
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