PT-2026-30411 · Zephyrproject Rtos · Zephyr

Published 2026-04-05 · Updated 2026-04-05 · CVE-2026-5590

NVD

CVSS v3.1

6.4

Medium

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

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.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-5590

Affected Products

Zephyr

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-5590 · Security Note
• https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4vqm-pw24-g9jp · Note
• https://twitter.com/cyberbivash/status/2040667287380709733 · Twitter Post