🛡️ AZL-64871 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2025-38257 affecting package kernel for versions less than 6.6.96.1-1

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).

Affected software

AZL-64871 is recorded against 1 package.

  • kernel (fixed in 6.6.96.1-1)

Timeline and source

Published on 9 July 2025 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2025-07-09
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 6.6.96.1-1

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