=========================================================================
Ubuntu Security Notice USN-4135-1
September 18, 2019

linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp,
linux-gke-4.15, linux-gke-5.0, linux-hwe, linux-kvm, linux-oem,
linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- 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-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors
- linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems
- linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oem: Linux kernel for OEM processors
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

Details:

Peter Pi discovered a buffer overflow in the virtio network backend
(vhost_net) implementation in the Linux kernel. An attacker in a guest may
be able to use this to cause a denial of service (host OS crash) or
possibly execute arbitrary code in the host OS. (CVE-2019-14835)

It was discovered that the Linux kernel on PowerPC architectures did not
properly handle Facility Unavailable exceptions in some situations. A local
attacker could use this to expose sensitive information. (CVE-2019-15030)

It was discovered that the Linux kernel on PowerPC architectures did not
properly handle exceptions on interrupts in some situations. A local
attacker could use this to expose sensitive information. (CVE-2019-15031)

Update instructions:

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

Ubuntu 19.04:
  linux-image-5.0.0-1016-aws      5.0.0-1016.18
  linux-image-5.0.0-1017-gcp      5.0.0-1017.17
  linux-image-5.0.0-1017-kvm      5.0.0-1017.18
  linux-image-5.0.0-1017-raspi2   5.0.0-1017.17
  linux-image-5.0.0-1020-azure    5.0.0-1020.21
  linux-image-5.0.0-1021-snapdragon  5.0.0-1021.22
  linux-image-5.0.0-29-generic    5.0.0-29.31
  linux-image-5.0.0-29-generic-lpae  5.0.0-29.31
  linux-image-5.0.0-29-lowlatency  5.0.0-29.31
  linux-image-aws                 5.0.0.1016.17
  linux-image-azure               5.0.0.1020.19
  linux-image-gcp                 5.0.0.1017.43
  linux-image-generic             5.0.0.29.30
  linux-image-generic-lpae        5.0.0.29.30
  linux-image-gke                 5.0.0.1017.43
  linux-image-kvm                 5.0.0.1017.17
  linux-image-lowlatency          5.0.0.29.30
  linux-image-raspi2              5.0.0.1017.14
  linux-image-snapdragon          5.0.0.1021.14
  linux-image-virtual             5.0.0.29.30

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1025-oracle  4.15.0-1025.28
  linux-image-4.15.0-1044-gcp     4.15.0-1044.70
  linux-image-4.15.0-1044-gke     4.15.0-1044.46
  linux-image-4.15.0-1046-kvm     4.15.0-1046.46
  linux-image-4.15.0-1047-raspi2  4.15.0-1047.51
  linux-image-4.15.0-1050-aws     4.15.0-1050.52
  linux-image-4.15.0-1056-oem     4.15.0-1056.65
  linux-image-4.15.0-1064-snapdragon  4.15.0-1064.71
  linux-image-4.15.0-64-generic   4.15.0-64.73
  linux-image-4.15.0-64-generic-lpae  4.15.0-64.73
  linux-image-4.15.0-64-lowlatency  4.15.0-64.73
  linux-image-5.0.0-1017-gke      5.0.0-1017.17~18.04.1
  linux-image-5.0.0-1020-azure    5.0.0-1020.21~18.04.1
  linux-image-5.0.0-29-generic    5.0.0-29.31~18.04.1
  linux-image-5.0.0-29-generic-lpae  5.0.0-29.31~18.04.1
  linux-image-5.0.0-29-lowlatency  5.0.0-29.31~18.04.1
  linux-image-aws                 4.15.0.1050.49
  linux-image-azure               5.0.0.1020.30
  linux-image-gcp                 4.15.0.1044.70
  linux-image-generic             4.15.0.64.66
  linux-image-generic-hwe-18.04   5.0.0.29.86
  linux-image-generic-lpae        4.15.0.64.66
  linux-image-generic-lpae-hwe-18.04  5.0.0.29.86
  linux-image-gke                 4.15.0.1044.47
  linux-image-gke-4.15            4.15.0.1044.47
  linux-image-gke-5.0             5.0.0.1017.7
  linux-image-kvm                 4.15.0.1046.46
  linux-image-lowlatency          4.15.0.64.66
  linux-image-lowlatency-hwe-18.04  5.0.0.29.86
  linux-image-oem                 4.15.0.1056.60
  linux-image-oracle              4.15.0.1025.28
  linux-image-powerpc-e500mc      4.15.0.64.66
  linux-image-powerpc-smp         4.15.0.64.66
  linux-image-powerpc64-emb       4.15.0.64.66
  linux-image-powerpc64-smp       4.15.0.64.66
  linux-image-raspi2              4.15.0.1047.45
  linux-image-snapdragon          4.15.0.1064.67
  linux-image-snapdragon-hwe-18.04  5.0.0.29.86
  linux-image-virtual             4.15.0.64.66
  linux-image-virtual-hwe-18.04   5.0.0.29.86

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1025-oracle  4.15.0-1025.28~16.04.1
  linux-image-4.15.0-1044-gcp     4.15.0-1044.46
  linux-image-4.15.0-1050-aws     4.15.0-1050.52~16.04.1
  linux-image-4.15.0-1059-azure   4.15.0-1059.64
  linux-image-4.15.0-64-generic   4.15.0-64.73~16.04.1
  linux-image-4.15.0-64-generic-lpae  4.15.0-64.73~16.04.1
  linux-image-4.15.0-64-lowlatency  4.15.0-64.73~16.04.1
  linux-image-4.4.0-1058-kvm      4.4.0-1058.65
  linux-image-4.4.0-1094-aws      4.4.0-1094.105
  linux-image-4.4.0-1122-raspi2   4.4.0-1122.131
  linux-image-4.4.0-1126-snapdragon  4.4.0-1126.132
  linux-image-4.4.0-164-generic   4.4.0-164.192
  linux-image-4.4.0-164-generic-lpae  4.4.0-164.192
  linux-image-4.4.0-164-lowlatency  4.4.0-164.192
  linux-image-4.4.0-164-powerpc-e500mc  4.4.0-164.192
  linux-image-4.4.0-164-powerpc-smp  4.4.0-164.192
  linux-image-4.4.0-164-powerpc64-emb  4.4.0-164.192
  linux-image-4.4.0-164-powerpc64-smp  4.4.0-164.192
  linux-image-aws                 4.4.0.1094.98
  linux-image-aws-hwe             4.15.0.1050.50
  linux-image-azure               4.15.0.1059.62
  linux-image-gcp                 4.15.0.1044.58
  linux-image-generic             4.4.0.164.172
  linux-image-generic-hwe-16.04   4.15.0.64.84
  linux-image-generic-lpae        4.4.0.164.172
  linux-image-generic-lpae-hwe-16.04  4.15.0.64.84
  linux-image-gke                 4.15.0.1044.58
  linux-image-kvm                 4.4.0.1058.58
  linux-image-lowlatency          4.4.0.164.172
  linux-image-lowlatency-hwe-16.04  4.15.0.64.84
  linux-image-oem                 4.15.0.64.84
  linux-image-oracle              4.15.0.1025.18
  linux-image-powerpc-e500mc      4.4.0.164.172
  linux-image-powerpc-smp         4.4.0.164.172
  linux-image-powerpc64-emb       4.4.0.164.172
  linux-image-powerpc64-smp       4.4.0.164.172
  linux-image-raspi2              4.4.0.1122.122
  linux-image-snapdragon          4.4.0.1126.118
  linux-image-virtual             4.4.0.164.172
  linux-image-virtual-hwe-16.04   4.15.0.64.84

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/4135-1
  CVE-2019-14835, CVE-2019-15030, CVE-2019-15031

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.0.0-29.31
  https://launchpad.net/ubuntu/+source/linux-aws/5.0.0-1016.18
  https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1020.21
  https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1017.17
  https://launchpad.net/ubuntu/+source/linux-kvm/5.0.0-1017.18
  https://launchpad.net/ubuntu/+source/linux-raspi2/5.0.0-1017.17
  https://launchpad.net/ubuntu/+source/linux-snapdragon/5.0.0-1021.22
  https://launchpad.net/ubuntu/+source/linux/4.15.0-64.73
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1050.52
  https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1020.21~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1044.70
  https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1044.46
  https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1017.17~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/5.0.0-29.31~18.04.1
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1046.46
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1056.65
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1025.28
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1047.51
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1064.71
  https://launchpad.net/ubuntu/+source/linux/4.4.0-164.192
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1094.105
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1050.52~16.04.1
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1059.64
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1044.46
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-64.73~16.04.1
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1058.65
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1025.28~16.04.1
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1122.131
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1126.132