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

CVE ID :CVE-2026-5068

Published : June 9, 2026, 8:16 a.m. | 19 minutes ago

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.

Severity: 7.6 | HIGH

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