The AsyncPixelTransfersCompletedQuery::End function in gpu/command_buffer/service/query_manager.cc in Google Chrome, as used in Google Chrome OS before 33.0.1750.152, does not check whether a certain position is within the bounds of a shared-memory segment, which allows remote attackers to cause a denial of service (GPU command-buffer memory corruption) or possibly have unspecified other impact via unknown vectors.
https://src.chromium.org/viewvc/chrome?revision=256918&view=revision
https://src.chromium.org/viewvc/chrome?revision=256723&view=revision
https://code.google.com/p/chromium/issues/detail?id=351852
http://googlechromereleases.blogspot.com/2014/03/stable-channel-update-for-chrome-os_14.html