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CVE-2025-39720

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix refcount leak causing resource not released When ksmbd_conn_releasing(opinfo->conn) returns true,the refcount was no…

Published Sep 5, 2025EPSS 0.29%

Overview

CVE-2025-39720 is a high-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix refcount leak causing resource not released

When ksmbd_conn_releasing(opinfo->conn) returns true,the refcount was not

decremented properly, causing a refcount leak that prevents the count from

reaching zero and the memory from being released.

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/36e010bb865fbaa1202fe9bcce3fd486d6db7606Refgit.kernel.org/stable/c/89bb430f621124af39bb31763c4a8b504c9651e2Refgit.kernel.org/stable/c/9a7abce6e8c0e2145b346a6d4abf0d9655e9b0e8Refgit.kernel.org/stable/c/a1d2bab4d53368a526c97aba92671dd71814f95a

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39720?

CVE-2025-39720 is a high-severity vulnerability. It was published on September 5, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-39720?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-39720?

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-2025-39720?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39720 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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