Please Install the Updated Packages.

A flaw was discovered in the Linux kernel's KVM (kernel virtual machine).An administrative user in the guest OS could leverage this flaw to cause a denial of service in the host OS. (CVE-2012-2121) Multiple integer overflow flaws where discovered in the Alchemy LCD frame- buffer drivers in the Linux kernel. An unprivileged local user could exploit this flaw to gain administrative privileges. (CVE-2013-4511)

linux on Ubuntu 10.04 LTS