CVE-2026-5590 | zephyrproject-rtos Zephyr up to 4.3 TCP Connection tcp_recv null pointer dereference (GHSA-4vqm-pw24-g9jp)

VDB-355387 · CVE-2026-5590 · GHSA-4VQM-PW24-G9JP ZEPHYRPROJECT-RTOS ZEPHYR UP TO 4.3 TCP CONNECTION TCP_RECV NULL POINTER DEREFERENCE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.8 $0-$5k 1.02+ Summaryinfo A vulnerability marked as problematic has been reported in zephyrproject-rtos Zephyr up to 4.3. Affected is the function tcp_recv of the component TCP Connection Handler. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2026-5590. The attack is possible to be carried out remotely. No exploit exists. Detailsinfo A vulnerability has been found in zephyrproject-rtos Zephyr up to 4.3 and classified as problematic. Affected by this vulnerability is the function tcp_recv of the component TCP Connection Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is: 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. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-5590 since 04/05/2026. The exploitation appears to be difficult. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Project Management Software Vendor zephyrproject-rtos Name Zephyr Version 4.0 4.1 4.2 4.3 License open-source Website Product: https://github.com/zephyrproject-rtos/zephyr/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.8 VulDB Meta Temp Score: 5.8 VulDB Base Score: 5.3 VulDB Temp Score: 5.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.4 CNA Vector (zephyr): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Null pointer dereference CWE: CWE-476 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/05/2026 Advisory disclosed 04/05/2026 +0 days CVE reserved 04/05/2026 +0 days VulDB entry created 04/05/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-4vqm-pw24-g9jp Status: Confirmed CVE: CVE-2026-5590 (🔒) GCVE (CVE): GCVE-0-2026-5590 GCVE (VulDB): GCVE-100-355387 Entryinfo Created: 04/05/2026 07:10 Changes: 04/05/2026 07:10 (65) Complete: 🔍 Cache ID: 99:209:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸