core/rendering/compositing/RenderLayerCompositor.cpp in Blink, as used in Google Chrome before 38.0.2125.102 on Android, does not properly handle a certain IFRAME overflow condition, which allows remote attackers to spoof content via a crafted web site that interferes with the scrollbar.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.