USN-1579-1: Linux kernel vulnerabilities

21 September 2012

linux vulnerabilities

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

  • Ubuntu 12.04 LTS


Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel


Ben Hutchings reported a flaw in the Linux kernel with some network drivers that support TSO (TCP segment offload). A local or peer user could exploit this flaw to to cause a denial of service. (CVE-2012-3412)

Jay Fenlason and Doug Ledford discovered a bug in the Linux kernel implementation of RDS sockets. A local unprivileged user could potentially use this flaw to read privileged information from the kernel. (CVE-2012-3430)

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 discovered in the requeuing of futexes in the Linux kernel. A local user could exploit this flaw to cause a denial of service (system crash) or possibly have other unspecified impact. (CVE-2012-6647)

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 versions:

Ubuntu 12.04 LTS
linux-image-3.2.0-31-generic - 3.2.0-31.50
linux-image-3.2.0-31-generic-pae - 3.2.0-31.50
linux-image-3.2.0-31-highbank - 3.2.0-31.50
linux-image-3.2.0-31-omap - 3.2.0-31.50
linux-image-3.2.0-31-powerpc-smp - 3.2.0-31.50
linux-image-3.2.0-31-powerpc64-smp - 3.2.0-31.50
linux-image-3.2.0-31-virtual - 3.2.0-31.50

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.