CVE-2026-46138Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
Updated under an hour ago ()
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a0bfde167b506423111ddb8cd71930497a40fc54 before 6cb7f67bc28da787499291a562d49a084d9c90cd; from a0bfde167b506423111ddb8cd71930497a40fc54 before 22559ad7654f61727fc270ee4893da9f4b70cf17; from a0bfde167b506423111ddb8cd71930497a40fc54 before 77981a507aa0fc001dc37f0dd6631dd2042fed17; from a0bfde167b506423111ddb8cd71930497a40fc54 before 665da0baaf0396f9ed3c86ccb3955dcd0b73e774; from a0bfde167b506423111ddb8cd71930497a40fc54 before 5ddb8014261137cadaf83ab5617a588d80a22586; b475c1109251e30ec21fb574d72a1c71a4ab0039; 2ccde10127447c1a5caad8469fede945bdb62fdf; from 6.4.16 before 6.5; and 1 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 6.4.16 before 6.5; from 6.5.3 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/6cb7f67bc28da787499291a562d49a084d9c90cdpatch
- https://git.kernel.org/stable/c/22559ad7654f61727fc270ee4893da9f4b70cf17patch
- https://git.kernel.org/stable/c/77981a507aa0fc001dc37f0dd6631dd2042fed17patch
- https://git.kernel.org/stable/c/665da0baaf0396f9ed3c86ccb3955dcd0b73e774patch
- https://git.kernel.org/stable/c/5ddb8014261137cadaf83ab5617a588d80a22586patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.