CVE-2015-0235 critical (for linux) aka GHOST.

[Elixer]

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2015-0235

Patch ASAP, or someone can send you a mail that compromises your system(s)!

A heap-based buffer overflow was found in glibc's __nss_hostname_digits_dots() function, which is used by the gethostbyname() and gethostbyname2() glibc function calls. A remote attacker able to make an application call either of these functions could use this flaw to execute arbitrary code with the permissions of the user running the application.

 

[Jodell88]

This is really for servers, and long lived distros like Ubuntu LTS 12.04.

Most distros should be using a newer glibc version than those affected.

 

[TheRyuu]

This was fixed in glibc 2.18 so most people should not be affected.