Well it's that time again for an essentially 0-day exploit. Some hosts have got hit by this already including HostGator (http://forums.hostgator.com/showthread.php?t=27629). Although I wouldn't say it's any hosts fault if they got hit by it yesterday Some distributions it affects that a lot of people run: CentOS5: http://bugs.centos.org/view.php?id=2667 Red Hat Enterprise 5: https://bugzilla.redhat.com/show_bug.cgi?id=432251 I would advise everyone apply the patch http://home.powertech.no/oystein/ptpatch2008/ if your distribution is affected. Other discussions I know of right now: http://www.webhostingtalk.com/showthread.php?t=670497
RHEL5 and CentOS5 both now have kernel updates available that fix the problem. I imagine it's the same for most distributions at this point.