CVE-2025-39694

MEDIUM EPSS 4.3%
Published Sep 5, 20259mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 5, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: s390/sclp: Fix SCCB present check Tracing code called by the SCLP interrupt handler contains early exits if the SCCB address associated with an interrupt is NULL. This check is performed after physical to virtual address translation. If the kernel identity mapping does not start at address zero, the resulting virtual address is never zero, so that the NULL checks won't work. Subsequently this may result in incorrect accesses to the first page of the identity mapping. Fix this by introducing a function that handles the NULL case before address translation.

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
4.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥5.16  –  <6.1.149
linuxlinux_kernel*≥6.2  –  <6.6.103
linuxlinux_kernel*≥6.7  –  <6.12.44
linuxlinux_kernel*≥6.13  –  <6.16.4
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
debiandebian_linux11.0any

References 7

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • git.kernel.org https://git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7b
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7b
    Patch