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CVE-2025-39926

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: genetlink: fix genl_bind() invoking bind() after -EPERM Per family bind/unbind callbacks were introduced to allow families to t…

Published Oct 1, 2025EPSS 0.14%

Overview

CVE-2025-39926 is a medium-severity vulnerability. It was published on October 1, 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:

genetlink: fix genl_bind() invoking bind() after -EPERM

Per family bind/unbind callbacks were introduced to allow families

to track multicast group consumer presence, e.g. to start or stop

producing events depending on listeners.

However, in genl_bind() the bind() callback was invoked even if

capability checks failed and ret was set to -EPERM. This means that

callbacks could run on behalf of unauthorized callers while the

syscall still returned failure to user space.

Fix this by only invoking bind() after "if (ret) break;" check

i.e. after permission checks have succeeded.

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/1dbfb0363224f6da56f6655d596dc5097308d6f5Refgit.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207Refgit.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39926?

CVE-2025-39926 is a medium-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-39926?

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-2025-39926?

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-2025-39926?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39926 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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