CVE-2026-5068 HIGH

CVE-2026-5068: bt: l2cap le coc: remote oob write via seg counter stored in net_buf user_data

Vendor Zephyrproject-Rtos
Product Zephyr
Weakness CWE-787
Published June 9, 2026
Last update June 9, 2026
View on NVD All CVEs

CVSS base score

7.6/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 9, 2026 Record updated