A critical vulnerability in glibc, the C library, affects all Linux machines and many web frameworks, opening the door to remote code execution. The flaw, CVE-2015-7547, is a stack-based buffer overflow in the DNS client-side resolver that puts Linux machines at risk. The vulnerability, discovered independently by researchers at Google and Red Hat, has been patched. It’s likely that all Linux servers and web frameworks such as Ruby, PHP and Python are affected.
Source: https://threatpost.com/critical-glibc-vulnerability-puts-all-linux-machines-at-risk/116261/