[USN-3084-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3084-1
September 19, 2016

linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

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 cause a denial of service (system crash). (CVE-2016-6156)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-38-generic    4.4.0-38.57
  linux-image-4.4.0-38-generic-lpae  4.4.0-38.57
  linux-image-4.4.0-38-lowlatency  4.4.0-38.57
  linux-image-4.4.0-38-powerpc-e500mc  4.4.0-38.57
  linux-image-4.4.0-38-powerpc-smp  4.4.0-38.57
  linux-image-4.4.0-38-powerpc64-emb  4.4.0-38.57
  linux-image-4.4.0-38-powerpc64-smp  4.4.0-38.57

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:
  http://www.ubuntu.com/usn/usn-3084-1
  CVE-2016-5412, CVE-2016-6136, CVE-2016-6156

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-38.57

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