Heap-based buffer overflow in the WebGL subsystem in Google Chrome OS before 23.0.1271.94 allows remote attackers to cause a denial of service (GPU process crash) or possibly have unspecified other impact via unknown vectors.
https://code.google.com/p/chromium/issues/detail?id=145525
http://www.ubuntu.com/usn/USN-1818-1
http://googlechromereleases.blogspot.com/2012/11/stable-update-for-chrome-os_30.html