https://en.wikipedia.org/wiki/Usage_share_of_operating_systems#Public_servers_on_the_Internet
>Internet based servers' market share can be measured with statistical surveys of publicly accessible servers, such as web servers, mail servers or DNS servers on the Internet
May 2015: Unix/linux-98.3% Windows-1.7%
So unless the system kernel is updated, most servers out there online are vulnerable to this exploit of uaccess.h