[USN-3633-1] Linux kernel (Intel Euclid) vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3633-1
April 24, 2018

linux-euclid vulnerability
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- linux-euclid: Linux kernel for Intel Euclid systems

Details:

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel improperly performed sign extension in some situations.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2017-16995)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-9026-euclid   4.4.0-9026.28
  linux-image-euclid              4.4.0.9026.27

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://usn.ubuntu.com/usn/usn-3633-1
  CVE-2017-16995

Package Information:
  https://launchpad.net/ubuntu/+source/linux-euclid/4.4.0-9026.28

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