Ref: http://magazine.redhat.com/2008/01/16/tips-and-tricks-yum-security/ Ref: http://www.cyberciti.biz/faq/redhat-fedora-centos-linux-yum-installs-security-updates/ Install Plugin Type the following command: # yum install yum-security How Do I Display Available Security Updates? Type the following command: # yum list-security Sample Outputs: Loaded plugins: rhnplugin, security RHSA-2009:1148-1 security httpd-2.2.3-22.el5_3.2.x86_64 RHSA-2009:1148-1 security httpd-devel-2.2.3-22.el5_3.2.i386 RHSA-2009:1148-1 security httpd-manual-2.2.3-22.el5_3.2.x86_64 RHSA-2009:1148-1 security mod_ssl-1:2.2.3-22.el5_3.2.x86_64 list-security done To list all updates that are security [...]