CVE-2026-23461

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to conn->users. However, l2cap_register_user() and l2cap_unregister_user() don't use conn->lock, creating a race condition where these functions can access conn->users and conn->hchan concurrently with l2cap_conn_del(). This can lead to use-after-free and list corruption bugs, as reported by syzbot. Fix this by changing l2cap_register_user() and l2cap_unregister_user() to use conn->lock instead of hci_dev_lock(), ensuring consistent locking for the l2cap_conn structure.

• linux linux kernel (>= 6.6.84 < 6.6.130) • linux linux kernel (>= 6.12.20 < 6.12.78) • linux linux kernel (>= 6.13.8 < 6.14) • linux linux kernel (>= 6.14.1 < 6.18.20) • linux linux kernel (>= 6.19 < 6.19.10) • linux linux kernel 6.14 • linux linux kernel 7.0