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Ubuntu 12.04 LTS USN-3160-2 Moderate: Kernel Security Issues

ubuntu
Calendar Grey December 20, 2016
Scroller Ubuntu
Vulnerabilities addressed in Ubuntu Trusty HWE kernel, impacting user permissions and overall system reliability.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise

Details:

USN-3160-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu

12.04 LTS.

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 information leak kernel ubuntu system crash dos modification

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.13.0-106-generic  3.13.0-106.153~precise1
  linux-image-3.13.0-106-generic-lpae  3.13.0-106.153~precise1
  linux-image-generic-lpae-lts-trusty  3.13.0.106.97
  linux-image-generic-lts-trusty  3.13.0.106.97

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-3160-2

https://ubuntu.com/security/notices/USN-3160-1

CVE-2016-6213, CVE-2016-7916

Severity
important
Lowest
Low
Medium
High
Critical

December 20, 2016

Topics%20covered

Topics Covered

security advisory information leak kernel ubuntu system crash dos modification

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-106.153~precise1

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