=========================================================================
Ubuntu Security Notice USN-4162-1
October 22, 2019

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

Details:

It was discovered that the RSI 91x Wi-Fi driver in the Linux kernel did not
did not handle detach operations correctly, leading to a use-after-free
vulnerability. A physically proximate attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2018-21008)

Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux
kernel did not properly perform bounds checking, leading to a heap
overflow. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-14814,
CVE-2019-14815, CVE-2019-14816)

Matt Delco discovered that the KVM hypervisor implementation in the Linux
kernel did not properly perform bounds checking when handling coalesced
MMIO write operations. A local attacker with write access to /dev/kvm could
use this to cause a denial of service (system crash). (CVE-2019-14821)

Hui Peng and Mathias Payer discovered that the USB audio driver for the
Linux kernel did not properly validate device meta data. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2019-15117)

Hui Peng and Mathias Payer discovered that the USB audio driver for the
Linux kernel improperly performed recursion while handling device meta
data. A physically proximate attacker could use this to cause a denial of
service (system crash). (CVE-2019-15118)

It was discovered that the Technisat DVB-S/S2 USB device driver in the
Linux kernel contained a buffer overread. A physically proximate attacker
could use this to cause a denial of service (system crash) or possibly
expose sensitive information. (CVE-2019-15505)

Brad Spengler discovered that a Spectre mitigation was improperly
implemented in the ptrace susbsystem of the Linux kernel. A local attacker
could possibly use this to expose sensitive information. (CVE-2019-15902)

It was discovered that the SMB networking file system implementation in the
Linux kernel contained a buffer overread. An attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-15918)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1027-oracle  4.15.0-1027.30
  linux-image-4.15.0-1046-gke     4.15.0-1046.49
  linux-image-4.15.0-1048-kvm     4.15.0-1048.48
  linux-image-4.15.0-1049-raspi2  4.15.0-1049.53
  linux-image-4.15.0-1052-aws     4.15.0-1052.54
  linux-image-4.15.0-1059-oem     4.15.0-1059.68
  linux-image-4.15.0-1066-snapdragon  4.15.0-1066.73
  linux-image-4.15.0-66-generic   4.15.0-66.75
  linux-image-4.15.0-66-generic-lpae  4.15.0-66.75
  linux-image-4.15.0-66-lowlatency  4.15.0-66.75
  linux-image-aws                 4.15.0.1052.51
  linux-image-generic             4.15.0.66.68
  linux-image-generic-lpae        4.15.0.66.68
  linux-image-gke                 4.15.0.1046.49
  linux-image-gke-4.15            4.15.0.1046.49
  linux-image-kvm                 4.15.0.1048.48
  linux-image-lowlatency          4.15.0.66.68
  linux-image-oem                 4.15.0.1059.63
  linux-image-oracle              4.15.0.1027.30
  linux-image-powerpc-e500mc      4.15.0.66.68
  linux-image-powerpc-smp         4.15.0.66.68
  linux-image-powerpc64-emb       4.15.0.66.68
  linux-image-powerpc64-smp       4.15.0.66.68
  linux-image-raspi2              4.15.0.1049.47
  linux-image-snapdragon          4.15.0.1066.69
  linux-image-virtual             4.15.0.66.68

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1027-oracle  4.15.0-1027.30~16.04.1
  linux-image-4.15.0-1047-gcp     4.15.0-1047.50
  linux-image-4.15.0-1052-aws     4.15.0-1052.54~16.04.1
  linux-image-4.15.0-1061-azure   4.15.0-1061.66
  linux-image-4.15.0-66-generic   4.15.0-66.75~16.04.1
  linux-image-4.15.0-66-generic-lpae  4.15.0-66.75~16.04.1
  linux-image-4.15.0-66-lowlatency  4.15.0-66.75~16.04.1
  linux-image-aws-hwe             4.15.0.1052.52
  linux-image-azure               4.15.0.1061.64
  linux-image-gcp                 4.15.0.1047.61
  linux-image-generic-hwe-16.04   4.15.0.66.86
  linux-image-generic-lpae-hwe-16.04  4.15.0.66.86
  linux-image-gke                 4.15.0.1047.61
  linux-image-lowlatency-hwe-16.04  4.15.0.66.86
  linux-image-oem                 4.15.0.66.86
  linux-image-oracle              4.15.0.1027.20
  linux-image-virtual-hwe-16.04   4.15.0.66.86

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/4162-1
  CVE-2018-21008, CVE-2019-14814, CVE-2019-14815, CVE-2019-14816,
  CVE-2019-14821, CVE-2019-15117, CVE-2019-15118, CVE-2019-15505,
  CVE-2019-15902, CVE-2019-15918

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-66.75
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1052.54
  https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1046.49
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1048.48
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1059.68
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1027.30
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1049.53
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1066.73
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1052.54~16.04.1
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1061.66
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1047.50
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-66.75~16.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1027.30~16.04.1