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CVE-2026-5590

6.4 · MEDIUM

A race condition during TCP connection teardown can cause tcp_recv() to operate on a connection that has already been released.

Published Apr 5, 2026CWE-476EPSS 0.27%

Overview

CVE-2026-5590 is a medium-severity vulnerability. It was published on April 5, 2026 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A race condition during TCP connection teardown can cause tcp_recv() to operate on a connection that has already been released. If tcp_conn_search() returns NULL while processing a SYN packet, a NULL pointer derived from stale context data is passed to tcp_backlog_is_full() and dereferenced without validation, leading to a crash.

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

GitHubgithub.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4vqm-pw24-g9jp

How CyberStrike helps

Frequently asked questions

What is CVE-2026-5590?

CVE-2026-5590 is a medium-severity vulnerability. It was published on April 5, 2026 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2026-5590?

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-5590?

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-2026-5590?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-5590 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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