CVE-2026-5590CWE-476

CVE-2026-5590

Medium · published April 5, 2026

CVSS v3.1
6.4
EPSS
0%
Percentile
18.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00274 · 18.8th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-04-05T08:16Z
Affected products (1)
ProductVersionsFixed in
zephyrproject/zephyr≤ 4.3.0—
References (1)
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-4vqm-pw24-g9jp · [email protected]
EPSS history
Timeline
  • 05 APR 03:34Z
    net: ip/tcp: Null pointer dereference can be triggered by a race condition
    cvelistv5