CVE-2026-46138

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa0bfde167b506423111ddb8cd71930497a40fc54 < 6cb7f67bc28da787499291a562d49a084d9c90cdaffected
LinuxLinuxa0bfde167b506423111ddb8cd71930497a40fc54 < 22559ad7654f61727fc270ee4893da9f4b70cf17affected
LinuxLinuxa0bfde167b506423111ddb8cd71930497a40fc54 < 77981a507aa0fc001dc37f0dd6631dd2042fed17affected
LinuxLinuxa0bfde167b506423111ddb8cd71930497a40fc54 < 665da0baaf0396f9ed3c86ccb3955dcd0b73e774affected
LinuxLinuxa0bfde167b506423111ddb8cd71930497a40fc54 < 5ddb8014261137cadaf83ab5617a588d80a22586affected
LinuxLinuxb475c1109251e30ec21fb574d72a1c71a4ab0039affected
LinuxLinux2ccde10127447c1a5caad8469fede945bdb62fdfaffected
LinuxLinux6.4.16 < 6.5affected
LinuxLinux6.5.3 < 6.6affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.140 <= 6.6.*unaffected
LinuxLinux6.12.88 <= 6.12.*unaffected
LinuxLinux6.18.30 <= 6.18.*unaffected
LinuxLinux7.0.7 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References