CVE-2026-90256

Published: Set 17, 2026 Last Modified: Set 17, 2026
ExploitDB:
Other exploit source:
Google Dorks:

Description

AI Translation Available

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.

https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b30172…
https://git.kernel.org/stable/c/2b66c83ff1751d6bd3201b3017206262ab46dc05
https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c…
https://git.kernel.org/stable/c/b495a3a9b33bc4e4613e685bf5c96c136caa22d8