The LinuxFoundation.org, Linux.com and Kernel.org websites have been taken offline. The reason? They appear to have been hacked!
While how this has exactly happened has not been explained, it does appear that kernel.org was compromised which gave the hackers root access to the servers. The following message has been put up on LinuxFoundation.org and Linux.com.
Linux Foundation infrastructure including LinuxFoundation.org, Linux.com, and their subdomains are down for maintenance due to a security breach that was discovered on September 8, 2011. The Linux Foundation made this decision in the interest of extreme caution and security best practices. We believe this breach was connected to the intrusion on kernel.org.
We are in the process of restoring services in a secure manner as quickly as possible. As with any intrusion and as a matter of caution, you should consider the passwords and SSH keys that you have used on these sites compromised. If you have reused these passwords on other sites, please change them immediately. We are currently auditing all systems and will update this statement when we have more information.
All the servers of Linux have been taken offline and the sites are expected to be restored soon.
Meanwhile you have been requested to change the passwords, if you have been using these on other sites too, as it is quite likely that the SSH keys and passwords of these sites could have been compromised.