=========================================================================
Ubuntu Security Notice USN-4526-1
September 22, 2020

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-gcp-4.15, linux-gke-4.15, linux-hwe, 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
- Ubuntu 14.04 ESM

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-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems
- linux-oem: Linux kernel for OEM systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems
- linux-snapdragon: Linux kernel for Qualcomm 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 AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)

It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)

It was discovered that the ADIS16400 IIO IMU Driver for the Linux kernel
did not properly deallocate memory in certain error conditions. A local
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2019-19061)

It was discovered that the AMD Audio Coprocessor driver for the Linux
kernel did not properly deallocate memory in certain error conditions. A
local attacker with the ability to load modules could use this to cause a
denial of service (memory exhaustion). (CVE-2019-19067)

It was discovered that the Atheros HTC based wireless driver in the Linux
kernel did not properly deallocate in certain error conditions. A local
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2019-19073, CVE-2019-19074)

It was discovered that the F2FS file system in the Linux kernel did not
properly perform bounds checking in some situations, leading to an out-of-
bounds read. A local attacker could possibly use this to expose sensitive
information (kernel memory). (CVE-2019-9445)

It was discovered that the VFIO PCI driver in the Linux kernel did not
properly handle attempts to access disabled memory spaces. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2020-12888)

It was discovered that the cgroup v2 subsystem in the Linux kernel did not
properly perform reference counting in some situations, leading to a NULL
pointer dereference. A local attacker could use this to cause a denial of
service or possibly gain administrative privileges. (CVE-2020-14356)

It was discovered that the state of network RNG in the Linux kernel was
potentially observable. A remote attacker could use this to expose
sensitive information. (CVE-2020-16166)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1054-oracle  4.15.0-1054.58
  linux-image-4.15.0-1070-gke     4.15.0-1070.73
  linux-image-4.15.0-1071-raspi2  4.15.0-1071.75
  linux-image-4.15.0-1083-aws     4.15.0-1083.87
  linux-image-4.15.0-1084-gcp     4.15.0-1084.95
  linux-image-4.15.0-1087-snapdragon  4.15.0-1087.95
  linux-image-4.15.0-1096-azure   4.15.0-1096.106
  linux-image-4.15.0-1097-oem     4.15.0-1097.107
  linux-image-4.15.0-118-generic  4.15.0-118.119
  linux-image-4.15.0-118-generic-lpae  4.15.0-118.119
  linux-image-4.15.0-118-lowlatency  4.15.0-118.119
  linux-image-aws-lts-18.04       4.15.0.1083.85
  linux-image-azure-lts-18.04     4.15.0.1096.69
  linux-image-gcp-lts-18.04       4.15.0.1084.102
  linux-image-generic             4.15.0.118.105
  linux-image-generic-lpae        4.15.0.118.105
  linux-image-gke                 4.15.0.1070.74
  linux-image-gke-4.15            4.15.0.1070.74
  linux-image-lowlatency          4.15.0.118.105
  linux-image-oem                 4.15.0.1097.101
  linux-image-oracle-lts-18.04    4.15.0.1054.64
  linux-image-powerpc-e500mc      4.15.0.118.105
  linux-image-powerpc-smp         4.15.0.118.105
  linux-image-powerpc64-emb       4.15.0.118.105
  linux-image-powerpc64-smp       4.15.0.118.105
  linux-image-raspi2              4.15.0.1071.68
  linux-image-snapdragon          4.15.0.1087.90
  linux-image-virtual             4.15.0.118.105

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1054-oracle  4.15.0-1054.58~16.04.1
  linux-image-4.15.0-1083-aws     4.15.0-1083.87~16.04.1
  linux-image-4.15.0-1084-gcp     4.15.0-1084.95~16.04.1
  linux-image-4.15.0-1096-azure   4.15.0-1096.106~16.04.1
  linux-image-4.15.0-118-generic  4.15.0-118.119~16.04.1
  linux-image-4.15.0-118-generic-lpae  4.15.0-118.119~16.04.1
  linux-image-4.15.0-118-lowlatency  4.15.0-118.119~16.04.1
  linux-image-aws-hwe             4.15.0.1083.79
  linux-image-azure               4.15.0.1096.90
  linux-image-azure-edge          4.15.0.1096.90
  linux-image-gcp                 4.15.0.1084.85
  linux-image-generic-hwe-16.04   4.15.0.118.119
  linux-image-generic-lpae-hwe-16.04  4.15.0.118.119
  linux-image-gke                 4.15.0.1084.85
  linux-image-lowlatency-hwe-16.04  4.15.0.118.119
  linux-image-oem                 4.15.0.118.119
  linux-image-oracle              4.15.0.1054.44
  linux-image-virtual-hwe-16.04   4.15.0.118.119

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1096-azure   4.15.0-1096.106~14.04.1
  linux-image-azure               4.15.0.1096.72

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/4526-1
  CVE-2019-18808, CVE-2019-19054, CVE-2019-19061, CVE-2019-19067,
  CVE-2019-19073, CVE-2019-19074, CVE-2019-9445, CVE-2020-12888,
  CVE-2020-14356, CVE-2020-16166

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-118.119
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1083.87
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1096.106
  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1084.95
  https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1070.73
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1097.107
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1054.58
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1071.75
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1087.95
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1083.87~16.04.1
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1096.106~16.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1084.95~16.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-118.119~16.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1054.58~16.04.1