Users will have to update the operating system in order to fix the problem
On May 2, Canonical announced that a couple vulnerabilities had been found in the Linux kernel packages, affecting the OMAP4 kernel of the Ubuntu 13.04 (Raring Ringtail) operating system.A couple of security issues were fixed in the kernel for Ubuntu 13.04 (Raring Ringtail).
For example, an error has been discovered in the Linux kernel's credential handling on unix sockets. A local user could have exploited this flaw in order to gain administrative privileges.
The security flaws can be fixed if you upgrade your system to the linux-image-3.8.0-19-generic (3.8.0-19.30) package. Don't forget to reboot your computer after the upgrade!
ATTENTION: Due to an unavoidable ABI change, the kernel packages have a new version number, which will force you to reinstall and recompile all third-party kernel modules you might have installed. Moreover, if you use the linux-restricted-modules package, you have to update it as well to get modules that work with the new Linux kernel version.