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CVE-2025-39795

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: block: avoid possible overflow for chunk_sectors check in blk_stack_limits() In blk_stack_limits(), we check that the t->chunk_…

Published Sep 12, 2025CWE-674EPSS 0.17%

Overview

CVE-2025-39795 is a medium-severity vulnerability. It was published on September 12, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

block: avoid possible overflow for chunk_sectors check in blk_stack_limits()

In blk_stack_limits(), we check that the t->chunk_sectors value is a

multiple of the t->physical_block_size value.

However, by finding the chunk_sectors value in bytes, we may overflow

the unsigned int which holds chunk_sectors, so change the check to be

based on sectors.

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/14beeef4aafecc8a41de534e31fb5be94739392fRefgit.kernel.org/stable/c/31f2f080898e50cbf2bae62d35f9f2a997547b38Refgit.kernel.org/stable/c/3b9d69f0e68aa6b0acd9791c45d445154a8c66e9Refgit.kernel.org/stable/c/418751910044649baa2b424ea31cce3fc4dcc253Refgit.kernel.org/stable/c/448dfecc7ff807822ecd47a5c052acedca7d09e8Refgit.kernel.org/stable/c/46aa80ef49594ed7de685ecbc673b291e9a2c159Refgit.kernel.org/stable/c/5e276e6ff9aacf8901b9c3265c3cdd2568c9fff2Refgit.kernel.org/stable/c/8b3ce085b52e674290cbfdd07034e7653ffbe4dcReflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39795?

CVE-2025-39795 is a medium-severity vulnerability. It was published on September 12, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-39795?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39795?

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-2025-39795?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39795 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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