diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index 358954bfbb32b..6b66d6a88b9a2 100644
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -1187,6 +1187,12 @@ static bool check_io_qos(struct bt_iso_io_qos *qos)
 
 static bool check_ucast_qos(struct bt_iso_qos *qos)
 {
+	if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET)
+		return false;
+
+	if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET)
+		return false;
+
 	if (qos->ucast.sca > 0x07)
 		return false;