==========================================================================
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


--+JUInw4efm7IfTNU

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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OeoL
-----END PGP SIGNATURE-----

--+JUInw4efm7IfTNU--