CVE-2025-38257

Published Jul 9, 2025

Last updated 4 months ago

CVSS high 7.8

Overview

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).
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Analyzed
Products
linux_kernel, debian_linux

Risk scores

CVSS 3.1

Type
Primary
Base score
7.8
Impact score
5.9
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity
HIGH

Weaknesses

nvd@nist.gov
NVD-CWE-noinfo

Social media

Hype score
Not currently trending

  1. 🚨 CRITICAL: #SUSE Linux Kernel Security Update 🚨 Patch 28 vulnerabilities (CVE-2025-38494, CVE-2025-38257) in SLE Micro 5.3/5.4. CVSS scores up to 7.8. Read more:👉 https://t.co/Uq6Ng4gLPE #Security https://t.co/srUB1R1XTw

    @Cezar_H_Linux

    19 Aug 2025

    11 Impressions

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Configurations

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References

Sources include official advisories and independent security research.