CVE-2025-38733

MEDIUM EPSS 4.0%
Published Sep 5, 20259mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 5, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: s390/mm: Do not map lowcore with identity mapping Since the identity mapping is pinned to address zero the lowcore is always also mapped to address zero, this happens regardless of the relocate_lowcore command line option. If the option is specified the lowcore is mapped twice, instead of only once. This means that NULL pointer accesses will succeed instead of causing an exception (low address protection still applies, but covers only parts). To fix this never map the first two pages of physical memory with the identity mapping.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥6.10.11  –  <6.11
linuxlinux_kernel*≥6.11.1  –  <6.12.44
linuxlinux_kernel*≥6.13  –  <6.16.4
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any

References 3

  • git.kernel.org https://git.kernel.org/stable/c/1d7864acd497cb468a998d44631f84896f885e85
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/30bf5728bb217a6d1ba73f44094c9b9c6bc9a567
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93f616ff870a1fb7e84d472cad0af651b18f9f87
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1d7864acd497cb468a998d44631f84896f885e85
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/30bf5728bb217a6d1ba73f44094c9b9c6bc9a567
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/93f616ff870a1fb7e84d472cad0af651b18f9f87
    Patch