Hello, We are running CentOS 5.5 on a server that is not reporting any security updates: [root at server01 ~]# yum -y --security check-update Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile * base: bay.uchicago.edu * extras: bay.uchicago.edu * updates: mirror.nyi.net Limiting package lists to security relevant ones No packages needed, for security, 261 available However, Nexpose, our vulnerability scanner detected otherwise. Upon digging deeper, I noticed that we are on a kernel version that has a known issue fixed in a later version: [root at server01 ~]# rpm -q kernel kernel-2.6.18-194.el5 kernel-2.6.18-194.8.1.el5 http://rhn.redhat.com/errata/RHSA-2010-0610.html http://lists.centos.org/pipermail/centos-announce/2010-August/016890.html I appreciate anyone's insight in helping me understand this a bit better. Thanks!