CVE-2026-5590: NULL Pointer Dereference in zephyrproject-rtos Zephyr
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.
AI Analysis
Technical Summary
This vulnerability in Zephyr RTOS occurs due to a race condition during TCP connection teardown. When tcp_conn_search() returns NULL while processing a SYN packet, tcp_recv() may use stale context data resulting in a NULL pointer being passed to tcp_backlog_is_full() without validation. This causes a NULL pointer dereference and crash, potentially impacting availability. The CVSS 3.1 base score is 6.4, reflecting network attack vector, high attack complexity, low privileges required, no user interaction, unchanged scope, and low confidentiality and integrity impact but high availability impact.
Potential Impact
The vulnerability can cause a denial of service via application crash due to NULL pointer dereference in the TCP stack of Zephyr RTOS. Confidentiality and integrity impacts are low, but availability is significantly affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been published. Users should monitor Zephyr project advisories for updates and consider mitigating exposure to untrusted network traffic if possible.
CVE-2026-5590: NULL Pointer Dereference in zephyrproject-rtos Zephyr
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Zephyr RTOS occurs due to a race condition during TCP connection teardown. When tcp_conn_search() returns NULL while processing a SYN packet, tcp_recv() may use stale context data resulting in a NULL pointer being passed to tcp_backlog_is_full() without validation. This causes a NULL pointer dereference and crash, potentially impacting availability. The CVSS 3.1 base score is 6.4, reflecting network attack vector, high attack complexity, low privileges required, no user interaction, unchanged scope, and low confidentiality and integrity impact but high availability impact.
Potential Impact
The vulnerability can cause a denial of service via application crash due to NULL pointer dereference in the TCP stack of Zephyr RTOS. Confidentiality and integrity impacts are low, but availability is significantly affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been published. Users should monitor Zephyr project advisories for updates and consider mitigating exposure to untrusted network traffic if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- zephyr
- Date Reserved
- 2026-04-05T03:23:27.992Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d1dada0a160ebd92844add
Added to database: 4/5/2026, 3:45:30 AM
Last enriched: 4/5/2026, 4:00:24 AM
Last updated: 4/5/2026, 9:53:08 AM
Views: 8
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