diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index ea4b4ec85b783..093aedebdf0ca 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -277,6 +277,8 @@ struct l2cap_conn_rsp {
 #define L2CAP_CR_SEC_BLOCK	0x0003
 #define L2CAP_CR_NO_MEM		0x0004
 #define L2CAP_CR_BAD_AMP	0x0005
+#define L2CAP_CR_INVALID_SCID	0x0006
+#define L2CAP_CR_SCID_IN_USE	0x0007
 
 /* credit based connect results */
 #define L2CAP_CR_LE_SUCCESS		0x0000
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index cf03a0122b2b3..2146e0f3b6f86 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -3816,9 +3816,17 @@ static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
 
 	result = L2CAP_CR_NO_MEM;
 
+	/* Check for valid dynamic CID range (as per Erratum 3253) */
+	if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_DYN_END) {
+		result = L2CAP_CR_INVALID_SCID;
+		goto response;
+	}
+
 	/* Check if we already have channel with that dcid */
-	if (__l2cap_get_chan_by_dcid(conn, scid))
+	if (__l2cap_get_chan_by_dcid(conn, scid)) {
+		result = L2CAP_CR_SCID_IN_USE;
 		goto response;
+	}
 
 	chan = pchan->ops->new_connection(pchan);
 	if (!chan)