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 properly.

References 5

• git.kernel.org https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17
• git.kernel.org https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586
• git.kernel.org https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774
• git.kernel.org https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cd
• git.kernel.org https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17

Remediation