diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index 91a3b277acdf..9a32e2cf69f1 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -83,7 +83,9 @@ static bool tb_xdomain_match(const struct tb_cfg_request *req,
 static bool tb_xdomain_copy(struct tb_cfg_request *req,
 			    const struct ctl_pkg *pkg)
 {
-	memcpy(req->response, pkg->buffer, req->response_size);
+	size_t len = min_t(size_t, pkg->frame.size, req->response_size);
+
+	memcpy(req->response, pkg->buffer, len);
 	req->result.err = 0;
 	return true;
 }