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CVE-2025-21795 – Linux Kernel NFS Server RPC Callback Hang Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21795 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 27, 2025

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/036ac2778f7b28885814c6fbc07e156ad1624d03
    Added Reference https://git.kernel.org/stable/c/23ad7797c74cd8f7f90617f1e59a8703e2b43908
    Added Reference https://git.kernel.org/stable/c/38d345f612503b850c2973e5a879f88e441b34d7
    Added Reference https://git.kernel.org/stable/c/cedfbb92cf97a6bff3d25633001d9c44442ee854
    Added Reference https://git.kernel.org/stable/c/e88d2451cd42e025465d6b51fd716a47b0b3800d
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