=========================================================================Ubuntu Security Notice USN-2858-3
January 05, 2016

linux-raspi2 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.10

Summary:

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

Software Description:
- linux-raspi2: Linux kernel for Raspberry Pi 2

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 15.10:
  linux-image-4.2.0-1018-raspi2   4.2.0-1018.25

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-2858-3
  https://ubuntu.com/security/notices/USN-2858-1
  CVE-2015-8660

Package Information:
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.2.0-1018.25