Index: /trunk/src/VBox/Devices/Network/DevE1000.cpp
===================================================================
--- /trunk/src/VBox/Devices/Network/DevE1000.cpp	(revision 83612)
+++ /trunk/src/VBox/Devices/Network/DevE1000.cpp	(revision 83613)
@@ -4171,5 +4171,5 @@
     }
 
-    if (cse == 0)
+    if (cse == 0 || cse >= u16PktLen)
         cse = u16PktLen - 1;
     else if (cse < css)