==========================================================================
Ubuntu Security Notice USN-5268-1
February 03, 2022

linux, linux-aws, linux-aws-hwe, linux-azure, linux-dell300x,
linux-gcp-4.15, linux-hwe, linux-kvm, 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 ESM
- 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-dell300x: Linux kernel for Dell 300x platforms
- linux-gcp-4.15: 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 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-hwe: Linux hardware enablement (HWE) kernel

Details:

Keyu Man discovered that the ICMP implementation in the Linux kernel did
not properly handle received ICMP error packets. A remote attacker could
use this to facilitate attacks on UDP based services that depend on source
port randomization. (CVE-2021-20322)

It was discovered that the Bluetooth subsystem in the Linux kernel
contained a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2021-3640)

Likang Luo discovered that a race condition existed in the Bluetooth
subsystem of the Linux kernel, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-3752)

Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel
did not properly perform bounds checking in some situations. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2021-42739)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1034-dell300x  4.15.0-1034.39
  linux-image-4.15.0-1086-oracle  4.15.0-1086.94
  linux-image-4.15.0-1102-raspi2  4.15.0-1102.109
  linux-image-4.15.0-1106-kvm     4.15.0-1106.108
  linux-image-4.15.0-1115-gcp     4.15.0-1115.129
  linux-image-4.15.0-1119-snapdragon  4.15.0-1119.128
  linux-image-4.15.0-167-generic  4.15.0-167.175
  linux-image-4.15.0-167-generic-lpae  4.15.0-167.175
  linux-image-4.15.0-167-lowlatency  4.15.0-167.175
  linux-image-aws-lts-18.04       4.15.0.1119.122
  linux-image-dell300x            4.15.0.1034.36
  linux-image-gcp-lts-18.04       4.15.0.1115.134
  linux-image-generic             4.15.0.167.156
  linux-image-generic-lpae        4.15.0.167.156
  linux-image-kvm                 4.15.0.1106.102
  linux-image-lowlatency          4.15.0.167.156
  linux-image-oracle-lts-18.04    4.15.0.1086.96
  linux-image-raspi2              4.15.0.1102.100
  linux-image-snapdragon          4.15.0.1119.122
  linux-image-virtual             4.15.0.167.156

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1086-oracle  4.15.0-1086.94~16.04.1
  linux-image-4.15.0-1130-azure   4.15.0-1130.143~16.04.1
  linux-image-4.15.0-167-generic  4.15.0-167.175~16.04.1
  linux-image-4.15.0-167-lowlatency  4.15.0-167.175~16.04.1
  linux-image-aws-hwe             4.15.0.1119.110
  linux-image-azure               4.15.0.1130.121
  linux-image-generic-hwe-16.04   4.15.0.167.159
  linux-image-lowlatency-hwe-16.04  4.15.0.167.159
  linux-image-lowlatency-hwe-16.04-edge  4.15.0.167.159
  linux-image-oem                 4.15.0.167.159
  linux-image-oracle              4.15.0.1086.74
  linux-image-virtual-hwe-16.04   4.15.0.167.159

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1130-azure   4.15.0-1130.143~14.04.1
  linux-image-azure               4.15.0.1130.103

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://ubuntu.com/security/notices/USN-5268-1
  CVE-2021-20322, CVE-2021-3640, CVE-2021-3752, CVE-2021-42739

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-167.175
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1119.127
  https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1034.39
  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1115.129
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1106.108
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1086.94
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1102.109
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1119.128