--- x/net/bluetooth/mgmt.c
+++ y/net/bluetooth/mgmt.c
@@ -9359,7 +9359,9 @@ void mgmt_index_removed(struct hci_dev *
 	if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
 		return;
 
+	hci_dev_lock(hdev);
 	mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
+	hci_dev_unlock(hdev);
 
 	if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
 		mgmt_index_event(MGMT_EV_UNCONF_INDEX_REMOVED, hdev, NULL, 0,