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CVE-2025-38481 – Linux Kernel Comedi Invalid Arg Error Vulnerability

The following table lists the changes that have been made to the
CVE-2025-38481 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

    Jul. 28, 2025

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

    comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large

    The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to
    hold the array of `struct comedi_insn`, getting the length from the
    `n_insns` member of the `struct comedi_insnlist` supplied by the user.
    The allocation will fail with a WARNING and a stack dump if it is too
    large.

    Avoid that by failing with an `-EINVAL` error if the supplied `n_insns`
    value is unreasonable.

    Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set
    this to the same value as `MAX_SAMPLES` (65536), which is the maximum
    allowed sum of the values of the member `n` in the array of `struct
    comedi_insn`, and sensible comedi instructions will have an `n` of at
    least 1.
    Added Reference https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc
    Added Reference https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c
    Added Reference https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90
    Added Reference https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3
    Added Reference https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76
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