CVE-2026-5590

MEDIUM

Zephyr < 4.3 - NULL Pointer Dereference via TCP Connection Teardown Race Condition

Title source: llm

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.

References (1)

Core 1

Core References

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4vqm-pw24-g9jp

Scores

CVSS v3 6.4

EPSS 0.0016

EPSS Percentile 5.4%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-476

Status published

Products (1)

zephyrproject-rtos/Zephyr < 4.3

Published Apr 05, 2026

Tracked Since Apr 05, 2026