==========================================================================
Ubuntu Security Notice USN-4209-1
December 02, 2019

linux, linux-aws, linux-aws-5.0, linux-gcp, linux-gke-5.0, linux-hwe,
linux-kvm, linux-oem-osp1, linux-oracle, linux-oracle-5.0, linux-raspi2
vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-aws-5.0: Linux kernel for Amazon Web Services (AWS) systems
- linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oem-osp1: Linux kernel for OEM processors
- linux-oracle-5.0: Linux kernel for Oracle Cloud systems

Details:

Jann Horn discovered that the OverlayFS and ShiftFS Drivers in the Linux
kernel did not properly handle reference counting during memory mapping
operations when used in conjunction with AUFS. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-15794)

It was discovered that a buffer overflow existed in the 802.11 Wi-Fi
configuration interface for the Linux kernel when handling beacon settings.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-16746)

It was discovered that there was a memory leak in the Advanced Buffer
Management functionality of the Netronome NFP4000/NFP6000 NIC Driver in the
Linux kernel during certain error scenarios. A local attacker could use
this to cause a denial of service (memory exhaustion). (CVE-2019-19076)

Update instructions:

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

Ubuntu 19.04:
  linux-image-5.0.0-1008-oracle   5.0.0-1008.13
  linux-image-5.0.0-1022-aws      5.0.0-1022.25
  linux-image-5.0.0-1023-kvm      5.0.0-1023.25
  linux-image-5.0.0-1023-raspi2   5.0.0-1023.24
  linux-image-5.0.0-1026-gcp      5.0.0-1026.27
  linux-image-5.0.0-37-generic    5.0.0-37.40
  linux-image-5.0.0-37-generic-lpae  5.0.0-37.40
  linux-image-5.0.0-37-lowlatency  5.0.0-37.40
  linux-image-aws                 5.0.0.1022.24
  linux-image-gcp                 5.0.0.1026.51
  linux-image-generic             5.0.0.37.39
  linux-image-generic-lpae        5.0.0.37.39
  linux-image-gke                 5.0.0.1026.51
  linux-image-kvm                 5.0.0.1023.24
  linux-image-lowlatency          5.0.0.37.39
  linux-image-oracle              5.0.0.1008.34
  linux-image-raspi2              5.0.0.1023.21
  linux-image-virtual             5.0.0.37.39

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1008-oracle   5.0.0-1008.13~18.04.1
  linux-image-5.0.0-1022-aws      5.0.0-1022.25~18.04.1
  linux-image-5.0.0-1026-gcp      5.0.0-1026.27~18.04.1
  linux-image-5.0.0-1026-gke      5.0.0-1026.27~18.04.2
  linux-image-5.0.0-1030-oem-osp1  5.0.0-1030.34
  linux-image-5.0.0-37-generic    5.0.0-37.40~18.04.1
  linux-image-5.0.0-37-generic-lpae  5.0.0-37.40~18.04.1
  linux-image-5.0.0-37-lowlatency  5.0.0-37.40~18.04.1
  linux-image-aws-edge            5.0.0.1022.36
  linux-image-gcp                 5.0.0.1026.30
  linux-image-generic-hwe-18.04   5.0.0.37.95
  linux-image-generic-lpae-hwe-18.04  5.0.0.37.95
  linux-image-gke-5.0             5.0.0.1026.15
  linux-image-lowlatency-hwe-18.04  5.0.0.37.95
  linux-image-oem-osp1            5.0.0.1030.34
  linux-image-oracle-edge         5.0.0.1008.7
  linux-image-snapdragon-hwe-18.04  5.0.0.37.95
  linux-image-virtual-hwe-18.04   5.0.0.37.95

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/4209-1
  CVE-2019-15794, CVE-2019-16746, CVE-2019-19076

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.0.0-37.40
  https://launchpad.net/ubuntu/+source/linux-aws/5.0.0-1022.25
  https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1026.27
  https://launchpad.net/ubuntu/+source/linux-kvm/5.0.0-1023.25
  https://launchpad.net/ubuntu/+source/linux-oracle/5.0.0-1008.13
  https://launchpad.net/ubuntu/+source/linux-raspi2/5.0.0-1023.24
  https://launchpad.net/ubuntu/+source/linux-aws-5.0/5.0.0-1022.25~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1026.27~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1026.27~18.04.2
  https://launchpad.net/ubuntu/+source/linux-hwe/5.0.0-37.40~18.04.1
  https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1030.34
  https://launchpad.net/ubuntu/+source/linux-oracle-5.0/5.0.0-1008.13~18.04.1