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Ubuntu 12.04 LTS USN-3167-1 Critical: Kernel Denial Of Service

ubuntu
Calendar Grey January 11, 2017
Scroller Ubuntu
Urgent security notice for Ubuntu pertaining to kernel vulnerabilities and required system patches to enhance protection.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Dmitry Vyukov discovered that the KVM implementation in the Linux

kernel did not properly initialize the Code Segment (CS) in certain

error cases. A local attacker could use this to expose sensitive

information (kernel memory).

Baozeng Ding discovered a race condition that could lead to a use-after-

free in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux

kernel. A local attacker could use this to cause a denial of service

(system crash). (CVE-2016-9794)

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu kernel system update

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-120-generic   3.2.0-120.163
  linux-image-3.2.0-120-generic-pae  3.2.0-120.163
  linux-image-3.2.0-120-highbank  3.2.0-120.163
  linux-image-3.2.0-120-omap      3.2.0-120.163
  linux-image-3.2.0-120-powerpc-smp  3.2.0-120.163
  linux-image-3.2.0-120-powerpc64-smp  3.2.0-120.163
  linux-image-3.2.0-120-virtual   3.2.0-120.163
  linux-image-generic             3.2.0.120.135
  linux-image-generic-pae         3.2.0.120.135
  linux-image-highbank            3.2.0.120.135
  linux-image-omap                3.2.0.120.135
  linux-image-powerpc-smp         3.2.0.120.135
  linux-image-powerpc64-smp       3.2.0.120.135
  linux-image-virtual             3.2.0.120.135

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

https://ubuntu.com/security/notices/USN-3167-1

CVE-2016-9756, CVE-2016-9794

Severity
critical
Lowest
Low
Medium
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Critical

January 11, 2017

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu kernel system update

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-120.163

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