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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
zephyrproject-rtos / Zephyr	affected 1.14.0 before 4.3.1

CWE

CWE-787

References

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.