CVE-2026-90093
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: access chan->conn safely in get/setsockopt
Since commit b66774b48dd9 ('Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref')
l2cap_chan::conn has held reference and remains non-NULL also after the
corresponding hci_conn is deleted. In this state accessing various
fields eg. hci_conn::hdev is invalid, which leads to KASAN crash in
l2cap_sock_setsockopt() access of conn->hcon->hdev.
Check l2cap_chan::conn.hcon corresponds to an alive hci_conn before
trying to use it in l2cap_sock.c. Hold l2cap_chan_lock() in
getsockopt/setsockopt to ensure it stays alive, and to avoid data races
in l2cap_chan fields.
https://git.kernel.org/stable/c/ca2c4c26498643f421d35ffe258fafbd3ed461c3
https://git.kernel.org/stable/c/f49321c85785178214fd67f2e9b4b73d6363783b