On Wed, 2009-10-21 at 11:11 -0500, slchavarria at iusacell.com.mx wrote: > Someone knows which security updates i have to apply to a host with > Centos 5.3 x_64. Yum knows :) $ yum --security check-update You may have to install yum-security first: # yum install yum-security .t.