The Gears plugin in Google Chrome before 3.0.195.32 allows user-assisted remote attackers to cause a denial of service (memory corruption and plugin crash) or possibly execute arbitrary code via unspecified use of the Gears SQL API, related to putting "SQL metadata into a bad state."
http://www.vupen.com/english/advisories/2009/3159
http://www.securityfocus.com/bid/36947
http://secunia.com/advisories/37273
http://googlechromereleases.blogspot.com/2009/11/stable-channel-update.html