CVE-2026-5068

A remote, unauthenticated BLE peer can trigger a 2-byte out-of-bounds write in the Bluetooth host during L2CAP LE CoC SDU reassembly. When the application enables segmentation (via chan_ops.alloc_buf) and the chosen RX pool has a user_data_size smaller than 2 bytes, the segmentation counter stored in the net_buf user_data area is written out of bounds in l2cap_chan_le_recv_seg (subsys/bluetooth/host/l2cap.c). The observed effects are an AddressSanitizer abort and, without ASan, heap corruption / fatal error.

CVSS v3 7.6 HIGH

7.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.7

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm	Exploit Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*

History

23 Jul 2026, 08:10

Type	Values Removed	Values Added
Summary		(es) Un par BLE remoto y no autenticado puede desencadenar una escritura fuera de límites de 2 bytes en el host Bluetooth durante el reensamblaje de SDU de L2CAP LE CoC. Cuando la aplicación habilita la segmentación (a través de chan_ops.alloc_buf) y el pool RX elegido tiene un user_data_size menor de 2 bytes, el contador de segmentación almacenado en el área user_data de net_buf se escribe fuera de límites en l2cap_chan_le_recv_seg (subsys/bluetooth/host/l2cap.c). Los efectos observados son una interrupción de AddressSanitizer y, sin ASan, corrupción de heap / error fatal.

08 Jul 2026, 13:25

Type	Values Removed	Values Added
References	~~() https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm -~~	() https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm - Exploit, Patch, Vendor Advisory
CPE		cpe:2.3:o:zephyrproject:zephyr::::::::
First Time		Zephyrproject zephyr Zephyrproject

09 Jun 2026, 08:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-09 08:16

Updated : 2026-07-23 08:10

NVD link : CVE-2026-5068

Mitre link : CVE-2026-5068

CVE.ORG link : CVE-2026-5068

JSON object : View

Products Affected

zephyrproject

zephyr

CWE

CWE-787

Out-of-bounds Write

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