=========================================================================
Ubuntu Security Notice USN-4163-1
October 22, 2019

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- 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-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

It was discovered that a race condition existed in the ARC EMAC ethernet
driver for the Linux kernel, resulting in a use-after-free vulnerability.
An attacker could use this to cause a denial of service (system crash).
(CVE-2016-10906)

It was discovered that a race condition existed in the Serial Attached SCSI
(SAS) implementation in the Linux kernel when handling certain error
conditions. A local attacker could use this to cause a denial of service
(kernel deadlock). (CVE-2017-18232)

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-2019-14816)

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)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1060-kvm      4.4.0-1060.67
  linux-image-4.4.0-1096-aws      4.4.0-1096.107
  linux-image-4.4.0-1124-raspi2   4.4.0-1124.133
  linux-image-4.4.0-1128-snapdragon  4.4.0-1128.136
  linux-image-4.4.0-166-generic   4.4.0-166.195
  linux-image-4.4.0-166-generic-lpae  4.4.0-166.195
  linux-image-4.4.0-166-lowlatency  4.4.0-166.195
  linux-image-4.4.0-166-powerpc-e500mc  4.4.0-166.195
  linux-image-4.4.0-166-powerpc-smp  4.4.0-166.195
  linux-image-4.4.0-166-powerpc64-emb  4.4.0-166.195
  linux-image-4.4.0-166-powerpc64-smp  4.4.0-166.195
  linux-image-aws                 4.4.0.1096.100
  linux-image-generic             4.4.0.166.174
  linux-image-generic-lpae        4.4.0.166.174
  linux-image-kvm                 4.4.0.1060.60
  linux-image-lowlatency          4.4.0.166.174
  linux-image-powerpc-e500mc      4.4.0.166.174
  linux-image-powerpc-smp         4.4.0.166.174
  linux-image-powerpc64-emb       4.4.0.166.174
  linux-image-powerpc64-smp       4.4.0.166.174
  linux-image-raspi2              4.4.0.1124.124
  linux-image-snapdragon          4.4.0.1128.120
  linux-image-virtual             4.4.0.166.174

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/4163-1
  CVE-2016-10906, CVE-2017-18232, CVE-2018-21008, CVE-2019-14814,
  CVE-2019-14816, CVE-2019-14821, CVE-2019-15117, CVE-2019-15118,
  CVE-2019-15505, CVE-2019-15902

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-166.195
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1096.107
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1060.67
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1124.133
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1128.136