USN-1554-1: Linux kernel vulnerability

Ubuntu Security Notice USN-1554-1

5th September, 2012

linux vulnerability

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

  • Ubuntu 11.10


The system could be made to crash under certain conditions.

Software description

  • linux - Linux kernel


A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS)
protocol implementation. A local, unprivileged user could use this flaw to
cause a denial of service. (CVE-2012-2372)

Mathias Krause discovered an information leak in the Linux kernel's TUN/TAP
device driver. A local user could exploit this flaw to examine part of the
kernel's stack memory. (CVE-2012-6547)

A flaw was found in Linux kernel's validation of CIPSO (Common IP Security
Option) options set from userspace. A local user that can set a socket's
CIPSO options could exploit this flaw to cause a denial of service (crash
the system). (CVE-2013-0310)

Update instructions

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

Ubuntu 11.10:
linux-image-3.0.0-25-server 3.0.0-25.41
linux-image-3.0.0-25-generic-pae 3.0.0-25.41
linux-image-3.0.0-25-powerpc 3.0.0-25.41
linux-image-3.0.0-25-powerpc64-smp 3.0.0-25.41
linux-image-3.0.0-25-generic 3.0.0-25.41
linux-image-3.0.0-25-powerpc-smp 3.0.0-25.41
linux-image-3.0.0-25-virtual 3.0.0-25.41
linux-image-3.0.0-25-omap 3.0.0-25.41

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-2012-2372, CVE-2012-6547, CVE-2013-0310