1. Home
  2. CVE Database
  3. CVE-2026-5590
MEDIUM · 6.4

CVE-2026-5590

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 ...

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

Affected Products

VendorProductVersions
ZephyrprojectZephyr<= 4.3.0

Related Weaknesses (CWE)

CWE-476

References

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. Affected products include: Zephyrproject Zephyr.