Mandriva Linux Security Advisory – A vulnerability in Postfix 2.4 and later was discovered, when running on Linux kernel 2.6, where a local user could cause a denial of service due to Postfix leaking the epoll file descriptor when executing non-Postfix commands. The updated packages have been patched to correct this issue.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/69855/MDVSA-2008-190.txt
Source: https://packetstormsecurity.com/files/69855/Mandriva-Linux-Security-Advisory-2008-190.html