HighFix available
Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.12.114, 6.6.160, 7.2.6
- CVEs
- CVE-2026-90256
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 19:45 UTC · Revision 1
Source evidence
Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
core-osv · Original sourcePublished 17 Sept 2026, 16:07 UTC
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.
osv:CVE-2026-90256
Kernel
Fixed versions: 6.6.160, 6.12.114, 7.2.6
Complete source record
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"title": "Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind",
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