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CVE-2025-39694

7.3 · HIGH

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 as…

Published Sep 5, 2025CWE-476EPSS 0.17%

Overview

CVE-2025-39694 is a high-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/430fa71027b6ac9bb0ce5532b8d0676777d4219aRefgit.kernel.org/stable/c/61605c847599fbfdfafe638607841c7d73719081Refgit.kernel.org/stable/c/86c2825791c3836a8f77a954b9c5ebe6fab410c5Refgit.kernel.org/stable/c/aa5073ac1a2a274812f3b04c278992e68ff67cc7Refgit.kernel.org/stable/c/bf83ae3537359af088d6577812ed93113dfbcb7bReflists.debian.org/debian-lts-announce/2025/10/msg00008.htmlRefcert-portal.siemens.com/productcert/html/ssa-032379.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39694?

CVE-2025-39694 is a high-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2025-39694?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39694?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-39694?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39694 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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