[USN-3522-1] Linux kernel vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3522-1
January 09, 2018

linux, linux-aws, linux-euclid, linux-kvm vulnerability
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-euclid: Linux kernel for Intel Euclid systems
- linux-kvm: Linux kernel for cloud environments

Details:

Jann Horn discovered that microprocessors utilizing speculative execution
and indirect branch prediction may allow unauthorized memory reads via
sidechannel attacks. This flaw is known as Meltdown. A local attacker could
use this to expose sensitive information, including kernel memory.
(CVE-2017-5754)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1015-kvm      4.4.0-1015.20
  linux-image-4.4.0-1047-aws      4.4.0-1047.56
  linux-image-4.4.0-108-generic   4.4.0-108.131
  linux-image-4.4.0-108-lowlatency  4.4.0-108.131
  linux-image-4.4.0-9021-euclid   4.4.0-9021.22
  linux-image-aws                 4.4.0.1047.49
  linux-image-euclid              4.4.0.9021.21
  linux-image-generic             4.4.0.108.113
  linux-image-kvm                 4.4.0.1015.15
  linux-image-lowlatency          4.4.0.108.113

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://www.ubuntu.com/usn/usn-3522-1
  CVE-2017-5754

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-108.131
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1047.56
  https://launchpad.net/ubuntu/+source/linux-euclid/4.4.0-9021.22
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1015.20

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