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Ubuntu 14.04 LTS USN-3035-3 Critical: Linux Kernel Denial of Service

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Calendar Grey July 14, 2016
Scroller Ubuntu
A significant problem leading to possible application failures under specific scenarios stemming from a Linux kernel defect in Ubuntu 14.04 LTS.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux-lts-wily: Linux hardware enablement kernel from Wily for Trusty

Details:

USN-3035-1 fixed vulnerabilities in the Linux kernel for Ubuntu 15.10.

This update provides the corresponding updates for the Linux Hardware

Enablement (HWE) kernel from Ubuntu 15.10 for Ubuntu 14.04 LTS.

Jan Stancek discovered that the Linux kernel's memory manager did not

properly handle moving pages mapped by the asynchronous I/O (AIO) ring

buffer to the other nodes. A local attacker could use this to cause a

denial of service (system crash).

Topics%20covered

Topics Covered

security advisory denial of service kernel update Ubuntu system crash

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.2.0-42-generic    4.2.0-42.49~14.04.1
  linux-image-4.2.0-42-generic-lpae  4.2.0-42.49~14.04.1
  linux-image-4.2.0-42-lowlatency  4.2.0-42.49~14.04.1
  linux-image-4.2.0-42-powerpc-e500mc  4.2.0-42.49~14.04.1
  linux-image-4.2.0-42-powerpc-smp  4.2.0-42.49~14.04.1
  linux-image-4.2.0-42-powerpc64-emb  4.2.0-42.49~14.04.1
  linux-image-4.2.0-42-powerpc64-smp  4.2.0-42.49~14.04.1

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-3035-3

https://ubuntu.com/security/notices/USN-3035-1

CVE-2016-3070

Severity
critical
Lowest
Low
Medium
High
Critical

July 14, 2016

Topics%20covered

Topics Covered

security advisory denial of service kernel update Ubuntu system crash

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-wily/4.2.0-42.49~14.04.1

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