Please Install the Updated Packages.

Vasily Kulikov discovered a flaw in the Linux Kernel's perf tool that allows for privilege escalation. A local could exploit this flaw to run commands as root when using the perf tool. (CVE-2013-1060) A flaw was discovered in the Xen subsystem of the Linux kernel when it provides a guest OS read-only access to disks that support TRIM or SCSI UNMAP. A privileged user in the guest OS could exploit this flaw to destroy data on the disk. (CVE-2013-2140) A flaw was discovered in the Linux kernel when an IPv6 socket is used to connect to an IPv4 destination. A unprivileged local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-2232) An information leak was discovered in the IPSec key_socket implementation in the Linux kernel. An local user could exploit this flaw to examine potentially sensitive information in kernel memory. (CVE-2013-2234) Hannes Frederic Sowa discovered a flaw in the setsockopt UDP_CORK option in the Linux kernel's IPv6 stack. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-4162) Hannes Frederic Sowa discovered a flaw in the IPv6 subsystem of the Linux kernel when the IPV6_MTU setsockopt option has been specified in combination with the UDP_CORK option. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-4163)

linux on Ubuntu 13.04