CVE-2026-90256
Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind hci_conn::l2cap_data is accessed without locks in l2cap_disconn_ind via hci_conn_timeout (disc_work) -> hci_proto_disconn_ind -> l2cap_disconn_ind. This is UAF if the l2cap_conn is deleted concurrently. disc_work is disabled sync in hci_conn_del(), so we cannot take hci_dev_lock in disc_work. Fix by using proto_lock to guard l2cap_data, in addition to hdev->lock which is held in other access paths.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 17, 2026 |
| Last Updated | Oct 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
efc30877bd4bc85fefe98d80af60fafc86e5775e < 0fa448369c87e20b2aeaeaca0187d698dd61f791 f87271d21dd4ee83857ca11b94e7b4952749bbae < 7c032b6d48a46634cbd58aaebad2638c00ad3b51 ab4eedb790cae44313759b50fe47da285e2519d5 < b495a3a9b33bc4e4613e685bf5c96c136caa22d8 ab4eedb790cae44313759b50fe47da285e2519d5 < 2b66c83ff1751d6bd3201b3017206262ab46dc05 18ab6b6078fa8191ca30a3065d57bf35d5635761 6.6.84 < 6.6.160 6.12.20 < 6.12.114 6.13.8 < 6.14
Linux / Linux
6.14
References
git.kernel.org: https://git.kernel.org/stable/c/0fa448369c87e20b2aeaeaca0187d698dd61f791 git.kernel.org: https://git.kernel.org/stable/c/7c032b6d48a46634cbd58aaebad2638c00ad3b51 git.kernel.org: https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8 git.kernel.org: https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05