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Ubuntu 14.04 LTS USN-3161-2 Moderate: Kernel Denial of Service Threats

ubuntu
Calendar Grey December 20, 2016
Scroller Ubuntu
Multiple vulnerabilities were discovered in the Ubuntu 14.04 LTS kernel, posing possible security threats. Urgent updates are essential to reduce these risks.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3161-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu

14.04 LTS.

Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the

TTY implementation in the Linux kernel. A local attacker could use this to

expose sensitive information (kernel memory). (CVE-2015-8964)

It was discovered that the Video For Linux Two (v4l2) implementation in the

Linux kernel did not properly handle multiple planes when processing a

VIDIOC_DQBUF ioctl(). A local attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2016-4568)

CAI Qian discovered that shared bind mounts in a mount namespace

exponentially added entries without restricti...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory moderate arbitrary code execution kernel ubuntu system crash linux hwe

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-57-generic    4.4.0-57.78~14.04.1
  linux-image-4.4.0-57-generic-lpae  4.4.0-57.78~14.04.1
  linux-image-4.4.0-57-lowlatency  4.4.0-57.78~14.04.1
  linux-image-4.4.0-57-powerpc-e500mc  4.4.0-57.78~14.04.1
  linux-image-4.4.0-57-powerpc-smp  4.4.0-57.78~14.04.1
  linux-image-4.4.0-57-powerpc64-emb  4.4.0-57.78~14.04.1
  linux-image-4.4.0-57-powerpc64-smp  4.4.0-57.78~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.57.44
  linux-image-generic-lts-xenial  4.4.0.57.44
  linux-image-lowlatency-lts-xenial  4.4.0.57.44
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.57.44
  linux-image-powerpc-smp-lts-xenial  4.4.0.57.44
  linux-image-powerpc64-emb-lts-xenial  4.4.0.57.44
  linux-image-powerpc64-smp-lts-xenial  4.4.0.57.44

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-3161-2

https://ubuntu.com/security/notices/USN-3161-1

CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-8630,

CVE-2016-8633, CVE-2016-8645, CVE-2016-9555

December 20, 2016

Topics%20covered

Topics Covered

security advisory moderate arbitrary code execution kernel ubuntu system crash linux hwe

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-57.78~14.04.1

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