==========================================================================
Ubuntu Security Notice USN-3641-1
May 08, 2018

linux, linux-aws, linux-azure, linux-euclid, linux-gcp, linux-hwe,
linux-kvm, linux-lts-xenial, linux-oem, linux-raspi2, and
linux-snapdragon vulnerabilities
==========================================================================

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

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-euclid: Linux kernel for Intel Euclid systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-kvm: Linux kernel for cloud environments
- linux-oem: Linux kernel for OEM processors
- linux-snapdragon: Linux kernel for Snapdragon processors
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Nick Peterson discovered that the Linux kernel did not
properly handle debug exceptions following a MOV/POP to SS
instruction. A local attacker could use this to cause a denial
of service (system crash). This issue only affected the amd64
architecture. (CVE-2018-8897)

Andy Lutomirski discovered that the KVM subsystem of the Linux kernel
did not properly emulate the ICEBP instruction following a MOV/POP
to SS instruction. A local attacker in a KVM virtual machine could
use this to cause a denial of service (guest VM crash) or possibly
escalate privileges inside of the virtual machine. This issue only
affected the i386 and amd64 architectures. (CVE-2018-1087)

Andy Lutomirski discovered that the Linux kernel did not properly
perform error handling on virtualized debug registers. A local
attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2018-1000199)

Update instructions:

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

Ubuntu 17.10:
  linux-image-4.13.0-1019-raspi2  4.13.0-1019.20
  linux-image-4.13.0-41-generic   4.13.0-41.46
  linux-image-4.13.0-41-generic-lpae  4.13.0-41.46
  linux-image-4.13.0-41-lowlatency  4.13.0-41.46
  linux-image-generic             4.13.0.41.44
  linux-image-generic-lpae        4.13.0.41.44
  linux-image-lowlatency          4.13.0.41.44
  linux-image-raspi2              4.13.0.1019.17

Ubuntu 16.04 LTS:
  linux-image-4.13.0-1015-gcp     4.13.0-1015.19
  linux-image-4.13.0-1016-azure   4.13.0-1016.19
  linux-image-4.13.0-1026-oem     4.13.0-1026.29
  linux-image-4.13.0-41-generic   4.13.0-41.46~16.04.1
  linux-image-4.13.0-41-generic-lpae  4.13.0-41.46~16.04.1
  linux-image-4.13.0-41-lowlatency  4.13.0-41.46~16.04.1
  linux-image-4.4.0-1023-kvm      4.4.0-1023.28
  linux-image-4.4.0-1057-aws      4.4.0-1057.66
  linux-image-4.4.0-1089-raspi2   4.4.0-1089.97
  linux-image-4.4.0-1092-snapdragon  4.4.0-1092.97
  linux-image-4.4.0-124-generic   4.4.0-124.148
  linux-image-4.4.0-124-generic-lpae  4.4.0-124.148
  linux-image-4.4.0-124-lowlatency  4.4.0-124.148
  linux-image-4.4.0-124-powerpc-e500mc  4.4.0-124.148
  linux-image-4.4.0-124-powerpc-smp  4.4.0-124.148
  linux-image-4.4.0-124-powerpc64-emb  4.4.0-124.148
  linux-image-4.4.0-124-powerpc64-smp  4.4.0-124.148
  linux-image-4.4.0-9027-euclid   4.4.0-9027.29
  linux-image-aws                 4.4.0.1057.59
  linux-image-azure               4.13.0.1016.17
  linux-image-euclid              4.4.0.9027.28
  linux-image-gcp                 4.13.0.1015.17
  linux-image-generic             4.4.0.124.130
  linux-image-generic-hwe-16.04   4.13.0.41.60
  linux-image-generic-lpae        4.4.0.124.130
  linux-image-generic-lpae-hwe-16.04  4.13.0.41.60
  linux-image-gke                 4.13.0.1015.17
  linux-image-kvm                 4.4.0.1023.22
  linux-image-lowlatency          4.4.0.124.130
  linux-image-lowlatency-hwe-16.04  4.13.0.41.60
  linux-image-oem                 4.13.0.1026.30
  linux-image-powerpc-e500mc      4.4.0.124.130
  linux-image-powerpc-smp         4.4.0.124.130
  linux-image-powerpc64-emb       4.4.0.124.130
  linux-image-powerpc64-smp       4.4.0.124.130
  linux-image-raspi2              4.4.0.1089.89
  linux-image-snapdragon          4.4.0.1092.84

Ubuntu 14.04 LTS:
  linux-image-3.13.0-147-generic  3.13.0-147.196
  linux-image-3.13.0-147-generic-lpae  3.13.0-147.196
  linux-image-3.13.0-147-lowlatency  3.13.0-147.196
  linux-image-3.13.0-147-powerpc-e500  3.13.0-147.196
  linux-image-3.13.0-147-powerpc-e500mc  3.13.0-147.196
  linux-image-3.13.0-147-powerpc-smp  3.13.0-147.196
  linux-image-3.13.0-147-powerpc64-emb  3.13.0-147.196
  linux-image-3.13.0-147-powerpc64-smp  3.13.0-147.196
  linux-image-4.4.0-1019-aws      4.4.0-1019.19
  linux-image-4.4.0-124-generic   4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-generic-lpae  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-lowlatency  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc-e500mc  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc-smp  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc64-emb  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc64-smp  4.4.0-124.148~14.04.1
  linux-image-aws                 4.4.0.1019.19
  linux-image-generic             3.13.0.147.157
  linux-image-generic-lpae        3.13.0.147.157
  linux-image-generic-lpae-lts-xenial  4.4.0.124.104
  linux-image-generic-lts-xenial  4.4.0.124.104
  linux-image-generic-pae         3.13.0.147.157
  linux-image-lowlatency          3.13.0.147.157
  linux-image-lowlatency-lts-xenial  4.4.0.124.104
  linux-image-powerpc-e500        3.13.0.147.157
  linux-image-powerpc-e500mc      3.13.0.147.157
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.124.104
  linux-image-powerpc-smp         3.13.0.147.157
  linux-image-powerpc-smp-lts-xenial  4.4.0.124.104
  linux-image-powerpc64-emb       3.13.0.147.157
  linux-image-powerpc64-emb-lts-xenial  4.4.0.124.104
  linux-image-powerpc64-smp       3.13.0.147.157
  linux-image-powerpc64-smp-lts-xenial  4.4.0.124.104

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-3641-1
  CVE-2018-1000199, CVE-2018-1087, CVE-2018-8897

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.13.0-41.46
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1019.20
  https://launchpad.net/ubuntu/+source/linux/4.4.0-124.148
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1057.66
  https://launchpad.net/ubuntu/+source/linux-azure/4.13.0-1016.19
  https://launchpad.net/ubuntu/+source/linux-euclid/4.4.0-9027.29
  https://launchpad.net/ubuntu/+source/linux-gcp/4.13.0-1015.19
  https://launchpad.net/ubuntu/+source/linux-hwe/4.13.0-41.46~16.04.1
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1023.28
  https://launchpad.net/ubuntu/+source/linux-oem/4.13.0-1026.29
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1089.97
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1092.97
  https://launchpad.net/ubuntu/+source/linux/3.13.0-147.196
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1019.19
  https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-124.148~14.04.1