CVE-2025-38257

High

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).

Package Linux Kernel
Published 2025-07-09
Last modified 2025-12-18
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 5.4 and later are affected. Fixed in 5.15.187, 6.1.143, 6.6.96, 6.12.36, 6.15.5, 6.16 and their respective stable series.

Affected from
≥ 5.4
Fixed in
✓ 5.15.187 5.15.x ✓ 6.1.143 6.1.x ✓ 6.6.96 6.6.x ✓ 6.12.36 6.12.x ✓ 6.15.5 6.15.x ✓ 6.16

References

The following references provide additional information about CVE-2025-38257 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

6 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2025-38257?

    CVE-2025-38257 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 5.4 onward and has been patched in 5.15.187, 6.1.143, 6.6.96 and others. CVE-2025-38257 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-38257?

    CVE-2025-38257 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2025-38257?

    Yes — CVE-2025-38257 has been patched. Fixed versions include 5.15.187, 6.1.143, 6.6.96 and others. If you are running Linux kernel 5.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2025-38257 actively exploited?

    No — CVE-2025-38257 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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