USN-1671-1: Linux kernel vulnerability

Ubuntu Security Notice USN-1671-1

18th December, 2012

linux vulnerability

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

  • Ubuntu 12.10


The system could be made to crash under certain conditions.

Software description

  • linux - Linux kernel


Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem
that can expose stale data. An unprivileged user could exploit this flaw to
cause an information leak. (CVE-2012-4508)

A flaw was discovered in the Linux kernel's handling of new hot-plugged
memory. An unprivileged local user could exploit this flaw to cause a
denial of service by crashing the system. (CVE-2012-5517)

An information leak was discovered in the Linux kernel's /dev/dvb device. A
local user could exploit this flaw to obtain sensitive information from the
kernel's stack memory. (CVE-2013-1928)

Update instructions

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

Ubuntu 12.10:
linux-image-3.5.0-21-powerpc64-smp 3.5.0-21.32
linux-image-3.5.0-21-highbank 3.5.0-21.32
linux-image-3.5.0-21-generic 3.5.0-21.32
linux-image-3.5.0-21-omap 3.5.0-21.32
linux-image-3.5.0-21-powerpc-smp 3.5.0-21.32

To update your system, please follow these instructions:

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.


CVE-2012-4508, CVE-2012-5517, CVE-2013-1928