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CVE-2025-39872

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: hsr: hold rcu and dev lock for hsr_get_port_ndev hsr_get_port_ndev calls hsr_for_each_port, which need to hold rcu lock.

Published Sep 23, 2025EPSS 0.15%

Overview

CVE-2025-39872 is a high-severity vulnerability. It was published on September 23, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

hsr: hold rcu and dev lock for hsr_get_port_ndev

hsr_get_port_ndev calls hsr_for_each_port, which need to hold rcu lock.

On the other hand, before return the port device, we need to hold the

device reference to avoid UaF in the caller function.

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/68a6729afd3e8e9a2a32538642ce92b96ccf9b1dRefgit.kernel.org/stable/c/847748fc66d08a89135a74e29362a66ba4e3ab15Refgit.kernel.org/stable/c/9433ba79c2ec3ec7c9a711748701549339c3438c

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39872?

CVE-2025-39872 is a high-severity vulnerability. It was published on September 23, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39872?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2025-39872?

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-2025-39872?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39872 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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