PT-2026-30411 · Tcp · Tcp

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

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Versions prior to a fix are affected.

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.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-5590

Affected Products

Tcp

References · 4

• 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
• https://twitter.com/CVEarity/status/2040800349532102923 · Twitter Post