[USN-3106-4] Linux kernel (Qualcomm Snapdragon) vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3106-4
October 20, 2016

linux-snapdragon vulnerability
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- linux-snapdragon: Linux kernel for Snapdragon Processors

Details:

It was discovered that a race condition existed in the memory manager of
the Linux kernel when handling copy-on-write breakage of private read-only
memory mappings. A local attacker could use this to gain administrative
privileges.

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1032-snapdragon  4.4.0-1032.36

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-3106-4
  http://www.ubuntu.com/usn/usn-3106-1
  CVE-2016-5195

Package Information:
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1032.36

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