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Ubuntu 14.04 LTS USN-3160-1 Critical: Kernel Denial Of Service

ubuntu
Calendar Grey December 20, 2016
Scroller Ubuntu
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

CAI Qian discovered that shared bind mounts in a mount namespace

exponentially added entries without restriction to the Linux kernel's mount

table. A local attacker could use this to cause a denial of service (system

crash). (CVE-2016-6213)

It was discovered that a race condition existed in the procfs

environ_read function in the Linux kernel, leading to an integer

underflow. A local attacker could use this to expose sensitive

information (kernel memory). (CVE-2016-7916)

Topics%20covered

Topics Covered

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

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-106-generic  3.13.0-106.153
  linux-image-3.13.0-106-generic-lpae  3.13.0-106.153
  linux-image-3.13.0-106-lowlatency  3.13.0-106.153
  linux-image-3.13.0-106-powerpc-e500  3.13.0-106.153
  linux-image-3.13.0-106-powerpc-e500mc  3.13.0-106.153
  linux-image-3.13.0-106-powerpc-smp  3.13.0-106.153
  linux-image-3.13.0-106-powerpc64-emb  3.13.0-106.153
  linux-image-3.13.0-106-powerpc64-smp  3.13.0-106.153
  linux-image-generic             3.13.0.106.114
  linux-image-generic-lpae        3.13.0.106.114
  linux-image-lowlatency          3.13.0.106.114
  linux-image-powerpc-e500        3.13.0.106.114
  linux-image-powerpc-e500mc      3.13.0.106.114
  linux-image-powerpc-smp         3.13.0.106.114
  linux-image-powerpc64-emb       3.13.0.106.114
  linux-image-powerpc64-smp       3.13.0.106.114

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-3160-1

CVE-2016-6213, CVE-2016-7916

Severity
critical
Lowest
Low
Medium
High
Critical

December 20, 2016

Topics%20covered

Topics Covered

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

Package Information

https://launchpad.net/ubuntu/+source/linux/3.13.0-106.153

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