CVE-2025-38257

HIGH EPSS 4.4%
Published Jul 9, 202511mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Jul 9, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

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).

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
4.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥5.4  –  <5.15.187
linuxlinux_kernel*≥5.16  –  <6.1.143
linuxlinux_kernel*≥6.2  –  <6.6.96
linuxlinux_kernel*≥6.7  –  <6.12.36
linuxlinux_kernel*≥6.13  –  <6.15.5
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
linuxlinux_kernel6.16any
debiandebian_linux11.0any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Mailing ListThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c
    Patch