Canonical has announced that several vulnerabilities have been discovered in the Linux kernel, affecting the Ubuntu 13.04 (Raring Ringtail) operating system.
According to Canonical, several security issues have been fixed in the kernel. A
For example, a null pointer flaw has been discovered in the Linux kernel's Ceph client. A remote attacker could have exploited this flaw to cause a denial of service.
The security flaws can be fixed if you upgrade your system(s) to linux-image-3.8.0-29-generic (3.8.0-29.42).
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.