CVE-2026-5590

| EUVD-2026-19028 MEDIUM
2026-04-05 zephyr
6.4
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

3
Analysis Generated
Apr 05, 2026 - 04:00 vuln.today
EUVD ID Assigned
Apr 05, 2026 - 04:00 euvd
EUVD-2026-19028
CVE Published
Apr 05, 2026 - 03:34 nvd
MEDIUM 6.4

Tags

Null Pointer Dereference Denial Of Service

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.

Analysis

Null pointer dereference in Zephyr RTOS TCP stack during connection teardown allows authenticated remote attackers to cause denial of service. A race condition in tcp_recv() processing of SYN packets causes tcp_conn_search() to return NULL on a released connection, which is then dereferenced without validation in tcp_backlog_is_full(), resulting in a crash. …

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Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +32
POC: 0

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CVE-2026-5590 vulnerability details – vuln.today
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