http://linux.slashdot.org/story/16/02/18/157239/magnitude-of-glibc-vulnerability-coming-to-light
http://arstechnica.com/security/2016/02/extremely-severe-bug-leaves-dizzying-number-of-apps-and-devices-vulnerable/ http://www.kb.cert.org/vuls/id/457759 If it has glibc on it and looks up things by DNS, it needs to be patched. That's just about every Linux distro in existence.
