Mesa, as used in Google Chrome before 21.0.1183.0 on the Acer AC700, Cr-48, and Samsung Series 5 and 5 550 Chromebook platforms, and the Samsung Chromebox Series 3, allows remote attackers to execute arbitrary code via unspecified vectors that trigger an "array overflow."
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0264
http://www.ubuntu.com/usn/USN-1623-1
http://www.mandriva.com/security/advisories?name=MDVSA-2013:103
http://secunia.com/advisories/51215
http://googlechromereleases.blogspot.com/2012/08/stable-channel-update-for-chrome-os.html