CVE-2025-38257

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

State: Published
Severity: 7.3 High
Published: Jul 9, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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).

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before ad1bdd24a02d5a8d119af8e4cd50933780a6d29fAffected f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before faa1ab4a23c42e34dc000ef4977b751d94d5148cAffected f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before 88f3869649edbc4a13f6c2877091f81cd5a50f05Affected f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before f855b119e62b004a5044ed565f2a2b368c4d3f16Affected f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before 73483ca7e07a5e39bdf612eec9d3d293e8bef649Affected f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before 7360ee47599af91a1d5f4e74d635d9408a54e489Affected
LinuxLinux	5.4Affected before 5.4Not affected 5.15.187 through 5.15.Not affected 6.1.143 through 6.1.Not affected 6.6.96 through 6.6.Not affected 6.12.36 through 6.12.Not affected 6.15.5 through 6.15.*Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before ad1bdd24a02d5a8d119af8e4cd50933780a6d29fAffected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before faa1ab4a23c42e34dc000ef4977b751d94d5148cAffected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before 88f3869649edbc4a13f6c2877091f81cd5a50f05Affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before f855b119e62b004a5044ed565f2a2b368c4d3f16Affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before 73483ca7e07a5e39bdf612eec9d3d293e8bef649Affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d to before 7360ee47599af91a1d5f4e74d635d9408a54e489Affected

LinuxLinux

5.4Affected
before 5.4Not affected
5.15.187 through 5.15.*Not affected
6.1.143 through 6.1.*Not affected
6.6.96 through 6.6.*Not affected
6.12.36 through 6.12.*Not affected
6.15.5 through 6.15.*Not affected
6.16 and laterNot affected

References

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