Use-after-free vulnerability in Google Chrome before 4.0.249.78 allows user-assisted remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via vectors involving the display of a blocked popup window during navigation to a different web site.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14069
http://sites.google.com/a/chromium.org/dev/Home/chromium-security/chromium-security-bugs
http://securitytracker.com/id?1023506
http://secunia.com/secunia_research/2009-65/
http://googlechromereleases.blogspot.com/2010/01/stable-channel-update_25.html