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Ubuntu 14.04 LTS: USN-3084-2 Moderate: Kernel Denial Of Service Fix

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Calendar Grey September 19, 2016
Scroller Ubuntu
Explore the Ubuntu Security Bulletin USN-3291-3 detailing crucial kernel enhancements addressing security flaws on Ubuntu 16.04 LTS.
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-3084-1 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.

Pengfei Wang discovered a race condition in the audit subsystem in the

Linux kernel. A local attacker could use this to corrupt audit logs or

disrupt system-call auditing. (CVE-2016-6136)

It was discovered that the powerpc and powerpc64 hypervisor-mode KVM

implementation in the Linux kernel for did not properly maintain state

about transactional memory. An unprivileged attacker in a guest could cause

a denial of service (CPU lockup) in the host OS. (CVE-2016-5412)

Pengfei Wang discovered a race condition in the Chrome OS embedded

controller device driver in the Linux kernel. A local attacker could use

this to cau...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel system update audit issue

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-38-generic    4.4.0-38.57~14.04.1
  linux-image-4.4.0-38-generic-lpae  4.4.0-38.57~14.04.1
  linux-image-4.4.0-38-lowlatency  4.4.0-38.57~14.04.1
  linux-image-4.4.0-38-powerpc-e500mc  4.4.0-38.57~14.04.1
  linux-image-4.4.0-38-powerpc-smp  4.4.0-38.57~14.04.1
  linux-image-4.4.0-38-powerpc64-emb  4.4.0-38.57~14.04.1
  linux-image-4.4.0-38-powerpc64-smp  4.4.0-38.57~14.04.1

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-3084-2

CVE-2016-5412, CVE-2016-6136, CVE-2016-6156

Severity
important
Lowest
Low
Medium
High
Critical

September 19, 2016

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel system update audit issue

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-38.57~14.04.1

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