[USN-3206-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3206-1
February 22, 2017

linux, linux-ti-omap4 vulnerabilities
==========================================================================

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel
- linux-ti-omap4: Linux kernel for OMAP4

Details:

It was discovered that a use-after-free vulnerability existed in the block
device layer of the Linux kernel. A local attacker could use this to cause
a denial of service (system crash) or possibly gain administrative
privileges. (CVE-2016-7910)

Dmitry Vyukov discovered a use-after-free vulnerability in the
sys_ioprio_get() function in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly gain
administrative privileges. (CVE-2016-7911)

Andrey Konovalov discovered a use-after-free vulnerability in the DCCP
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash) or possibly gain administrative
privileges. (CVE-2017-6074)

Update instructions:

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-123-generic   3.2.0-123.166
  linux-image-3.2.0-123-generic-pae  3.2.0-123.166
  linux-image-3.2.0-123-highbank  3.2.0-123.166
  linux-image-3.2.0-123-omap      3.2.0-123.166
  linux-image-3.2.0-123-powerpc-smp  3.2.0-123.166
  linux-image-3.2.0-123-powerpc64-smp  3.2.0-123.166
  linux-image-3.2.0-123-virtual   3.2.0-123.166
  linux-image-3.2.0-1501-omap4    3.2.0-1501.128
  linux-image-generic             3.2.0.123.138
  linux-image-generic-pae         3.2.0.123.138
  linux-image-highbank            3.2.0.123.138
  linux-image-omap                3.2.0.123.138
  linux-image-omap4               3.2.0.1501.96
  linux-image-powerpc-smp         3.2.0.123.138
  linux-image-powerpc64-smp       3.2.0.123.138
  linux-image-virtual             3.2.0.123.138

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  http://www.ubuntu.com/usn/usn-3206-1
  CVE-2016-7910, CVE-2016-7911, CVE-2017-6074

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-123.166
  https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1501.128

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