[USN-2858-2] Linux kernel (Wily HWE) vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-2858-2
January 05, 2016

linux-lts-wily vulnerability
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

The system could be made to run programs as an administrator.

Software Description:
- linux-lts-wily: Linux hardware enablement kernel from Wily

Details:

Nathan Williams discovered that overlayfs in the Linux kernel incorrectly
handled setattr operations. A local unprivileged attacker could use this to
create files with administrative permission attributes and execute
arbitrary code with elevated privileges.

Update instructions:

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

Ubuntu 14.04 LTS:
  linux-image-4.2.0-23-generic    4.2.0-23.28~14.04.1
  linux-image-4.2.0-23-generic-lpae  4.2.0-23.28~14.04.1
  linux-image-4.2.0-23-lowlatency  4.2.0-23.28~14.04.1
  linux-image-4.2.0-23-powerpc-e500mc  4.2.0-23.28~14.04.1
  linux-image-4.2.0-23-powerpc-smp  4.2.0-23.28~14.04.1
  linux-image-4.2.0-23-powerpc64-emb  4.2.0-23.28~14.04.1
  linux-image-4.2.0-23-powerpc64-smp  4.2.0-23.28~14.04.1

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:
  http://www.ubuntu.com/usn/usn-2858-2
  http://www.ubuntu.com/usn/usn-2858-1
  CVE-2015-8660

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-wily/4.2.0-23.28~14.04.1

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