6.9 - USN-1974-1

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04

Summary:

Several security issues were fixed in the kernel.

Software Description: - linux: Linux kernel

Details:

Vince Weaver discovered a flaw in the perf subsystem of the Linux kernel on ARM platforms. A local user could exploit this flaw to gain privileges or cause a denial of service (system crash). (CVE-2013-4254)

A memory leak was discovered in the user namespace facility of the Linux kernel. A local user could cause a denial of service (memory consumption) via the CLONE_NEWUSER unshare call. (CVE-2013-4205)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 13.04:
linux-image-3.8.0-31-generic 3.8.0-31.46

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.

References:
http://www.ubuntu.com/usn/usn-1974-1
CVE-2013-4205, CVE-2013-4254

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.8.0-31.46