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Ubuntu Security Notice USN-3484-1

Ubuntu Security Notice USN-3484-1
Posted Nov 20, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3484-1 - It was discovered that the KVM subsystem in the Linux kernel did not properly keep track of nested levels in guest page tables. A local attacker in a guest VM could use this to cause a denial of service or possibly execute arbitrary code in the host OS.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-12188
MD5 | 4e3b827121d1541ad1c6d68c8831039e

Ubuntu Security Notice USN-3484-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3484-1
November 21, 2017

linux, linux-raspi2 vulnerability
==========================================================================

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

- Ubuntu 17.04

Summary:

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

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

Details:

It was discovered that the KVM subsystem in the Linux kernel did not
properly keep track of nested levels in guest page tables. A local attacker
in a guest VM could use this to cause a denial of service (host OS crash)
or possibly execute arbitrary code in the host OS.

Update instructions:

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

Ubuntu 17.04:
linux-image-4.10.0-1021-raspi2 4.10.0-1021.24
linux-image-4.10.0-40-generic 4.10.0-40.44
linux-image-4.10.0-40-generic-lpae 4.10.0-40.44
linux-image-4.10.0-40-lowlatency 4.10.0-40.44
linux-image-generic 4.10.0.40.40
linux-image-generic-lpae 4.10.0.40.40
linux-image-lowlatency 4.10.0.40.40
linux-image-raspi2 4.10.0.1021.22

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-3484-1
CVE-2017-12188

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.10.0-40.44
https://launchpad.net/ubuntu/+source/linux-raspi2/4.10.0-1021.24

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