diff --git a/bin/cat/cat.c b/bin/cat/cat.c
--- a/bin/cat/cat.c
+++ b/bin/cat/cat.c
@@ -84,6 +84,7 @@
 #ifndef BOOTSTRAP_CAT
 static void cook_cat(FILE *);
 #endif
+static int in_kernel_copy(int);
 static void raw_cat(int);
 
 #ifndef NO_UDOM_SUPPORT
@@ -280,7 +281,11 @@
 			}
 #endif
 		} else {
-			raw_cat(fd);
+			if (in_kernel_copy(fd) == -1) {
+				if (errno == EINVAL)
+					raw_cat(fd);
+				else
+					err(1, "stdout");
 			if (fd != STDIN_FILENO)
 				close(fd);
 		}
@@ -382,6 +387,20 @@
 }
 #endif /* BOOTSTRAP_CAT */
 
+static int
+in_kernel_copy(int rfd)
+{
+	int ret, wfd;
+
+	wfd = fileno(stdout);
+	ret = 1;
+
+	while (ret > 0)
+		ret = copy_file_range(rfd, NULL, wfd, NULL, SSIZE_MAX, 0);
+
+	return (ret);
+}
+
 static void
 raw_cat(int rfd)
 {