CVE-2026-46138

About vulnerability

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 properly. A flaw was found in the Linux kernel’s Bluetooth subsystem, specifically within the hci_le_create_big_complete_evt function. A remote attacker, by sending a specially crafted LE_Create_BIG_Complete event from a malicious Bluetooth controller, could trigger an out-of-bounds read and an infinite loop. This vulnerability can lead to a Denial of Service (DoS) due to the system becoming unresponsive while holding the hci_dev_lock.

Live-patch status from KernelCare for each operating system.