Code to exploit the bug has been released by Mr Aboukhadijeh and he set up a website, called Filldisk that, on vulnerable PCs, dumps lots of images of cats on to the hard drive.
Of course, the exploit that they've actually released is completely harmless, but it demonstrates that the CPU cache can be "poisoned" to let folks read and write into the otherwise protected SMRAM memory.
Developers of the Metasploit framework for hackers and penetration testers have released a module that should exploit the vulnerability on machines running Windows, Apple OS X, and Linux regardless of the browser they're using.