diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index cd758994b02f..bc04c444c98e 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2703,6 +2703,8 @@ static int set_fast_connectable(struct sock *sk, struct hci_dev *hdev,
 
 static bool ltk_is_valid(struct mgmt_ltk_info *key)
 {
+	if (key->authenticated != 0x00 && key->authenticated != 0x01)
+		return false;
 	if (key->master != 0x00 && key->master != 0x01)
 		return false;
 	return true;