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CVE-2023-53304

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: fix overlap expiration walk The lazy gc on insert that should remove timed-out entries fails to rele…

Published Sep 16, 2025CWE-476EPSS 0.16%

Overview

CVE-2023-53304 is a medium-severity vulnerability. It was published on September 16, 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: nft_set_rbtree: fix overlap expiration walk

The lazy gc on insert that should remove timed-out entries fails to release

the other half of the interval, if any.

Can be reproduced with tests/shell/testcases/sets/0044interval_overlap_0

in nftables.git and kmemleak enabled kernel.

Second bug is the use of rbe_prev vs. prev pointer.

If rbe_prev() returns NULL after at least one iteration, rbe_prev points

to element that is not an end interval, hence it should not be removed.

Lastly, check the genmask of the end interval if this is active in the

current generation.

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/50cbb9d195c197af671869c8cadce3bd483735a0Refgit.kernel.org/stable/c/8284a79136c384059e85e278da2210b809730287Refgit.kernel.org/stable/c/893cb3c3513cf661a0ff45fe0cfa83fe27131f76Refgit.kernel.org/stable/c/89a4d1a89751a0fbd520e64091873e19cc0979e8Refgit.kernel.org/stable/c/acaee227cf79c45a5d2d49c3e9a66333a462802cRefgit.kernel.org/stable/c/cd66733932399475fe933cb3ec03e687ed401462Refgit.kernel.org/stable/c/f718863aca469a109895cb855e6b81fff4827d71

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53304?

CVE-2023-53304 is a medium-severity vulnerability. It was published on September 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53304?

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-2023-53304?

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-2023-53304?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53304 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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