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CVE-2025-38257 – IBM s390 Memory Corruption Vulnerability

The following table lists the changes that have been made to the
CVE-2025-38257 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. 09, 2025

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

    s390/pkey: Prevent overflow in size calculation for memdup_user()

    Number of apqn target list entries contained in ‘nr_apqns’ variable is
    determined by userspace via an ioctl call so the result of the product in
    calculation of size passed to memdup_user() may overflow.

    In this case the actual size of the allocated area and the value
    describing it won’t be in sync leading to various types of unpredictable
    behaviour later.

    Use a proper memdup_array_user() helper which returns an error if an
    overflow is detected. Note that it is different from when nr_apqns is
    initially zero – that case is considered valid and should be handled in
    subsequent pkey_handler implementations.

    Found by Linux Verification Center (linuxtesting.org).
    Added Reference https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649
    Added Reference https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489
    Added Reference https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05
    Added Reference https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16
    Added Reference https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c
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