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Ubuntu 14.04 LTS USN-3099-2 Moderate Kernel Denial of Service

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Calendar Grey October 11, 2016
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The Ubuntu Security Notice USN-3100-1 deals with severe kernel vulnerabilities impacting LTS versions and provides essential update instructions.
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-3099-1 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.

Vladimír Beneš discovered an unbounded recursion in the VLAN and TEB

Generic Receive Offload (GRO) processing implementations in the Linux

kernel, A remote attacker could use this to cause a stack corruption,

leading to a denial of service (system crash). (CVE-2016-7039)

Marco Grassi discovered a use-after-free condition could occur in the TCP

retransmit queue handling code in the Linux kernel. A local attacker could

use this to cause a denial of service (system crash) or possibly execute

arbitrary code. (CVE-2016-6828)

Pengfei Wang discovered a race condition in the Adaptec AAC RAID cont...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory kernel update instructions ubuntu system crash deny service hwe kernel

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-42-generic    4.4.0-42.62~14.04.1
  linux-image-4.4.0-42-generic-lpae  4.4.0-42.62~14.04.1
  linux-image-4.4.0-42-lowlatency  4.4.0-42.62~14.04.1
  linux-image-4.4.0-42-powerpc-e500mc  4.4.0-42.62~14.04.1
  linux-image-4.4.0-42-powerpc-smp  4.4.0-42.62~14.04.1
  linux-image-4.4.0-42-powerpc64-emb  4.4.0-42.62~14.04.1
  linux-image-4.4.0-42-powerpc64-smp  4.4.0-42.62~14.04.1

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-3099-2

https://ubuntu.com/security/notices/USN-3099-1

CVE-2016-6480, CVE-2016-6828, CVE-2016-7039

Severity
important
Lowest
Low
Medium
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Critical

October 11, 2016

Topics%20covered

Topics Covered

security advisory kernel update instructions ubuntu system crash deny service hwe kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-42.62~14.04.1

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