Even besides the vulnerability, the EFF has pointed out other major problems with the DRM technology including "undisclosed communications with servers Sony controls… undisclosed installation of over 18 MB of software regardless of whether the user agrees to the End User License Agreement; and failure to include an uninstaller with the CD." So there are some obvious privacy concerns with this DRM too.
However this time it is not just Sony using the DRM, over 30 other labels also use it according to the EFF, which is investigating whether any of those labels' CDs include the same vulnerability. A link to the patch, a list of infected titles and more important information can be found at the EFF's website.
Sources:
The Register
Electronic Frontier Foundation