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CVE-2026-5590

net: ip/tcp: Null pointer dereference can be triggered by a race condition

Published: Apr 5, 2026Updated: Apr 7, 2026 Sources: CVE List NVDCWE-476
NVD MITRE
6.4CVSSMEDIUM
EPSS Score
0.2%
Top 94.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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 Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:LI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:HAvailability
High
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Weaknesses

CWE-476

Affected Products

Zephyrzephyrproject-rtos
On-premOS
Operating Systems / rtos-embedded-os
zephyrproject-rtososs-projectOperating Systemsaka zephyr

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Apr 5, 2026
Last Updated
Apr 7, 2026

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