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Review reviewHigh

CVE-2025-38257

Linux Linux, linux kernel, debian linux

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 i...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.07.09
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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 i...

Affected product and versions

Product
Linux Linux, linux kernel, debian linux
Affected versions
>= f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < ad1bdd24a02d5a8d119af8e4cd50933780a6d29f, >= f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < faa1ab4a23c42e34dc000ef4977b751d94d5148c, >= f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < 88f3869649edbc4a13f6c2877091f81cd5a50f05, >= f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < f855b119e62b004a5044ed565f2a2b368c4d3f16, >= f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < 73483ca7e07a5e39bdf612eec9d3d293e8bef649, >= f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d < 7360ee47599af91a1d5f4e74d635d9408a54e489, >= 5.4, >= 5.4 < 5.15.187, >= 5.16 < 6.1.143, >= 6.2 < 6.6.96, >= 6.7 < 6.12.36, >= 6.13 < 6.15.5, 6.16, 11.0
Fixed versions
5.15.187, 6.1.143, 6.6.96, 6.12.36, 6.15.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, debian linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available