diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 1dfb7505758030beb3484d1129e9eae286af5779..cc2d0c3b475b5d192a5b3e71b1ce6426514a4b63 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -182,6 +182,9 @@ struct adv_info {
 
 #define HCI_MAX_SHORT_NAME_LENGTH	10
 
+/* Min encryption key size to match with SMP */
+#define HCI_MIN_ENC_KEY_SIZE		7
+
 /* Default LE RPA expiry time, 15 minutes */
 #define HCI_DEFAULT_RPA_TIMEOUT		(15 * 60)
 
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index bd4978ce8c45330219e823fad140b7b586622c92..3cf0764d5793f42c55b39caf79a7e15734fbc40d 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1276,6 +1276,14 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
 	    !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
 		return 0;
 
+	/* The minimum encryption key size needs to be enforced by the
+	 * host stack before establishing any L2CAP connections. The
+	 * specification in theory allows a minimum of 1, but to align
+	 * BR/EDR and LE transports, a minimum of 7 is chosen.
+	 */
+	if (conn->enc_key_size < HCI_MIN_ENC_KEY_SIZE)
+		return 0;
+
 	return 1;
 }