Attackers have compromised a number of servers at kernel.org that house the Linux kernel source code. Attackers were able to modify files and log user activity on the machines. However, it appears right now as though the Linux source code repositories were not affected by the attack. The attack happened some time in August and site officials discovered it on Sunday. An email that appears to come from an administrator at the site was posted on Pastebin Wednesday and says that the attackers used a Trojan in part of the attack sequence.
Source: https://threatpost.com/kernelorg-linux-site-compromised-083111/75604/