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Ubuntu Security Notice USN-1974-1
September 27, 2013

linux vulnerabilities

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

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