In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_conn: Fix null ptr deref in hci_abort_conn()

hci_abort_conn() read hci_skb_event(hdev->sent_cmd) when a connection
was pending, but hdev->sent_cmd can be NULL while req_status is still
HCI_REQ_PEND, leading to a NULL pointer dereference and a general
protection fault from the hci_rx_work() receive path.

Instead of inspecting hdev->sent_cmd, track the in-flight create
connection command with a new per-connection HCI_CONN_CREATE flag and
route all cancellation through hci_cancel_connect_sync(), which
dispatches to a dedicated per-type cancel function. The create command
is in exactly one of two states: still queued, or in flight. The cancel
function holds cmd_sync_work_lock across the whole decision: the worker
takes this lock to dequeue every entry, so while it is held a queued
command cannot start running and an in-flight command cannot complete
and let the next command become pending. This keeps the flag test and
hci_cmd_sync_cancel() atomic with respect to the worker, so a queued
command is simply dequeued, and an in-flight command owned by this
connection is cancelled without the risk of cancelling an unrelated
command that became pending in the meantime. CIS uses the same flag
mechanism via HCI_CONN_CREATE_CIS but cannot be dequeued per-connection.

hci_acl_create_conn_sync() and hci_le_create_conn_sync() clear
HCI_CONN_CREATE after the create command completes, but the command
status handler can free conn via hci_conn_del() (for example when the
controller rejects the connection) while the worker is still blocked on
the connection complete event. Hold a reference on conn across the
create command so the flag can be cleared without a use-after-free.

https://git.kernel.org/stable/c/12917f591cea1af36087dba5b9ec888652f0b42a

https://git.kernel.org/stable/c/61701912c58a05f6a043f097cc177a964abef348

https://git.kernel.org/stable/c/70c397b62ee015e19b3924d9da741c8dda017819

https://git.kernel.org/stable/c/83b22d7f7c384564fa42c3cf19bec715c693d7a2

https://git.kernel.org/stable/c/903227b6168bb99fd57d4e3c9c1b5014986198e0

https://git.kernel.org/stable/c/b42cb640a0493d16b61ddd267420274be15efdc1

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