diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index c0dbad9e8713..7cb438c4ed0d 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -5913,6 +5913,13 @@ static int l2cap_le_connect_req(struct l2cap_conn *conn,
 		goto response_unlock;
 	}
 
+	/* Check if Key Size is sufficient for the security level */
+	if (!l2cap_check_enc_key_size(conn->hcon, pchan)) {
+		result = L2CAP_CR_LE_BAD_KEY_SIZE;
+		chan = NULL;
+		goto response_unlock;
+	}
+
 	/* Check for valid dynamic CID range */
 	if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) {
 		result = L2CAP_CR_LE_INVALID_SCID;