CVE-2026-46138
published 2026-05-28CVE-2026-46138: 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…
high8.1CVSS 3.1
AVAACLPRNUINSUCHINAH
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
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 6.4.16 < 6.5 | 6.5 |
| linux | linux | >= 6.5.3 < 6.6 | 6.6 |
| linux | linux | >= a0bfde167b506423111ddb8cd71930497a40fc54 < 6cb7f67bc28da787499291a562d49a084d9c90cd | 6cb7f67bc28da787499291a562d49a084d9c90cd |
| linux | linux | >= a0bfde167b506423111ddb8cd71930497a40fc54 < 22559ad7654f61727fc270ee4893da9f4b70cf17 | 22559ad7654f61727fc270ee4893da9f4b70cf17 |
| linux | linux | >= a0bfde167b506423111ddb8cd71930497a40fc54 < 77981a507aa0fc001dc37f0dd6631dd2042fed17 | 77981a507aa0fc001dc37f0dd6631dd2042fed17 |
| linux | linux | >= a0bfde167b506423111ddb8cd71930497a40fc54 < 665da0baaf0396f9ed3c86ccb3955dcd0b73e774 | 665da0baaf0396f9ed3c86ccb3955dcd0b73e774 |
| linux | linux | >= a0bfde167b506423111ddb8cd71930497a40fc54 < 5ddb8014261137cadaf83ab5617a588d80a22586 | 5ddb8014261137cadaf83ab5617a588d80a22586 |
| linux | linux_kernel | — | — |