A serious security flaw has been found in the glibc libraries that are core component of Linux.  CVE-2015-0235 has been setup for this issue. It affects Red Hat Linux and its variants (CentOS, OracleLinux), Debian Linux and its variants like Ubuntu.  The GHOST bug is a overflow bug that has been found in the gethostbyname feature in glibc.

RedHat 4,5,6,7
​https://access.redhat.com/articles/1332213

Fedora 19 and earlier
http://fedoramagazine.org/worried-about-ghost-dont-be-on-supported-fedora-versions/

CVE-2015-0235
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0235

Michael Spice can help with detection and resolution of this issue.