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.
https://src.chromium.org/viewvc/blink?revision=182021&view=revision
http://googlechromereleases.blogspot.com/2014/10/chrome-for-android-update.html