Ubuntu Security Notice 1232-2 - USN-1232-1 fixed vulnerabilities in the X.Org X server. A regression was found on Ubuntu 10.04 LTS that affected GLX support. This update temporarily disables the fix for CVE-2010-4818 that introduced the regression.
5502fbdbb0fed96f08a70ba5f6600455a027ada81be5373f73f0064996e51f42