CVE-2026-46138

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt

hci_le_create_big_complete_evt() iterates over BT_BOUND connections for

a BIG handle using a while loop, accessing ev->bis_handle[i++] on each

iteration. However, there is no check that i stays within ev->num_bis

before the array access.

When a controller sends a LE_Create_BIG_Complete event with fewer

bis_handle entries than there are BT_BOUND connections for that BIG,

or with num_bis=0, the loop reads beyond the valid bis_handle[] flex

array into adjacent heap memory. Since the out-of-bounds values

typically exceed HCI_CONN_HANDLE_MAX (0x0EFF), hci_conn_set_handle()

rejects them and the connection remains in BT_BOUND state. The same

connection is then found again by hci_conn_hash_lookup_big_state(),

creating an infinite loop with hci_dev_lock held.

Fix this by terminating the BIG if in case not all BIS could be setup

properl

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References