An attacker can remotly crash without user interaction, any Vista/Windows 7 machine with SMB enable.
Windows Xp, 2k, are NOT affected as they dont have this driver.
Via: http://seclists.org/fulldisclosure/2009/Sep/0039.html
Not much to say on this other than let’s hope MS gets their act together. Coding a old bug into a new OS doesn’t build much confidence…