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CVE-2026-23139

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: update last_gc only when GC has been performed Currently last_gc is being updated everytime a new conn…

Published Feb 14, 2026EPSS 0.38%

Overview

CVE-2026-23139 is a high-severity vulnerability. It was published on February 14, 2026 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:

netfilter: nf_conncount: update last_gc only when GC has been performed

Currently last_gc is being updated everytime a new connection is

tracked, that means that it is updated even if a GC wasn't performed.

With a sufficiently high packet rate, it is possible to always bypass

the GC, causing the list to grow infinitely.

Update the last_gc value only when a GC has been actually performed.

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/26a82dce2beee39c43c109d9647e16f49cb02a35Refgit.kernel.org/stable/c/2c7c71113ed6d3e2f3aca4c088f22283016ff34fRefgit.kernel.org/stable/c/3cd717359e56f82f06cbf8279b47a7d79880c6f3Refgit.kernel.org/stable/c/7811ba452402d58628e68faedf38745b3d485e3cRefgit.kernel.org/stable/c/8bdafdf4900040a81422056cabe5e00a37bd101aRefgit.kernel.org/stable/c/9f45588993d7f115280fc726119ca86fba32a811Refgit.kernel.org/stable/c/c4cde57c8affdcca5bcff53a1047e15d268bdca1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23139?

CVE-2026-23139 is a high-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-23139?

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-2026-23139?

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-2026-23139?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23139 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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