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CVE-2025-21994 – Linux ksmbd Integer Overflow Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21994 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

    Apr. 02, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    ksmbd: fix incorrect validation for num_aces field of smb_acl

    parse_dcal() validate num_aces to allocate posix_ace_state_array.

    if (num_aces > ULONG_MAX / sizeof(struct smb_ace *))

    It is an incorrect validation that we can create an array of size ULONG_MAX.
    smb_acl has ->size field to calculate actual number of aces in request buffer
    size. Use this to check invalid num_aces.
    Added Reference https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64
    Added Reference https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675
    Added Reference https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd
    Added Reference https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19
    Added Reference https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2
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