UNKNOWN NVD
CVE-2026-90256
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_d
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.
References
- https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05
- https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8
This unknown severity vulnerability was published on 2026-09-17 via NVD.
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