CVE-2026-5068

Description

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.

PUBLISHED Reserved 2026-03-27 | Published 2026-06-09 | Updated 2026-06-09 | Assigner zephyr

Problem types

Out-of-bounds Write

Product status

References

github.com/...zephyr/security/advisories/GHSA-qrcq-hxwj-mqxm

cve.org (CVE-2026-5068)

nvd.nist.gov (CVE-2026-5068)

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