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CVE-2025-39764

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: remove refcounting in expectation dumpers Same pattern as previous patch: do not keep the expectation obj…

Published Sep 11, 2025EPSS 0.17%

Overview

CVE-2025-39764 is a medium-severity vulnerability. It was published on September 11, 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:

netfilter: ctnetlink: remove refcounting in expectation dumpers

Same pattern as previous patch: do not keep the expectation object

alive via refcount, only store a cookie value and then use that

as the skip hint for dump resumption.

AFAICS this has the same issue as the one resolved in the conntrack

dumper, when we do

if (!refcount_inc_not_zero(&exp->use))

to increment the refcount, there is a chance that exp == last, which

causes a double-increment of the refcount and subsequent memory leak.

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/078d33c95bf534d37aa04269d1ae6158e20082d5Refgit.kernel.org/stable/c/1492e3dcb2be3aa46d1963da96aa9593e4e4db5aRefgit.kernel.org/stable/c/64b7684042246e3238464c66894e30ba30c7e851Refgit.kernel.org/stable/c/9e5021a906532ca16e2aac69c0607711e1c70b1fRefgit.kernel.org/stable/c/a4d634ded4d3d400f115d84f654f316f249531c9Refgit.kernel.org/stable/c/b05500444b8eb97644efdd180839a04a706be97cRefgit.kernel.org/stable/c/bada48ad5b0590e318d0f79636ff62a2ef9f4955Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39764?

CVE-2025-39764 is a medium-severity vulnerability. It was published on September 11, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-39764?

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-2025-39764?

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-2025-39764?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39764 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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