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CVE-2025-39875

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: igb: Fix NULL pointer dereference in ethtool loopback test The igb driver currently causes a NULL pointer dereference when exec…

Published Sep 23, 2025CWE-476EPSS 0.13%

Overview

CVE-2025-39875 is a medium-severity vulnerability. It was published on September 23, 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:

igb: Fix NULL pointer dereference in ethtool loopback test

The igb driver currently causes a NULL pointer dereference when executing

the ethtool loopback test. This occurs because there is no associated

q_vector for the test ring when it is set up, as interrupts are typically

not added to the test rings.

Since commit 5ef44b3cb43b removed the napi_id assignment in

__xdp_rxq_info_reg(), there is no longer a need to pass a napi_id to it.

Therefore, simply use 0 as the last parameter.

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/473be7d39efd3be383e9c0c8e44b53508b4ffeb5Refgit.kernel.org/stable/c/75871a525a596ff4d16c4aebc0018f8d0923c9b1

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39875?

CVE-2025-39875 is a medium-severity vulnerability. It was published on September 23, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-39875?

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-2025-39875?

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-2025-39875?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39875 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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