CVE-2026-5590 — MEDIUM (6.4)

Vulnerability 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.

CVSS Score

6.4

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

HIGH

Related Weaknesses (CWE)

CWE-476

References

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4vqm-pw24-

FAQ

What is CVE-2026-5590?

CVE-2026-5590 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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 ...

How severe is CVE-2026-5590?

CVE-2026-5590 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-5590?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.