==========================================================================
Ubuntu Security Notice USN-5298-1
February 22, 2022

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-oracle,
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-azure-4.15: Linux kernel for Microsoft Azure Cloud 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-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 Packet network protocol implementation in the
Linux kernel contained a double-free vulnerability. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2021-22600)

Jürgen Groß discovered that the Xen subsystem within the Linux kernel did
not adequately limit the number of events driver domains (unprivileged PV
backends) could send to other guest VMs. An attacker in a driver domain
could use this to cause a denial of service in other guest VMs.
(CVE-2021-28711, CVE-2021-28712, CVE-2021-28713)

Jürgen Groß discovered that the Xen network backend driver in the Linux
kernel did not adequately limit the amount of queued packets when a guest
did not process them. An attacker in a guest VM can use this to cause a
denial of service (excessive kernel memory consumption) in the network
backend domain. (CVE-2021-28714, CVE-2021-28715)

Szymon Heidrich discovered that the USB Gadget subsystem in the Linux
kernel did not properly restrict the size of control requests for certain
gadget types, leading to possible out of bounds reads or writes. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2021-39685)

Jann Horn discovered a race condition in the Unix domain socket
implementation in the Linux kernel that could result in a read-after-free.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-4083)

Kirill Tkhai discovered that the XFS file system implementation in the
Linux kernel did not calculate size correctly when pre-allocating space in
some situations. A local attacker could use this to expose sensitive
information. (CVE-2021-4155)

Lin Ma discovered that the NFC Controller Interface (NCI) implementation in
the Linux kernel contained a race condition, 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-2021-4202)

Sushma Venkatesh Reddy discovered that the Intel i915 graphics driver in
the Linux kernel did not perform a GPU TLB flush in some situations. A
local attacker could use this to cause a denial of service or possibly
execute arbitrary code. (CVE-2022-0330)

It was discovered that the VMware Virtual GPU driver in the Linux kernel
did not properly handle certain failure conditions, leading to a stale
entry in the file descriptor table. A local attacker could use this to
expose sensitive information or possibly gain administrative privileges.
(CVE-2022-22942)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1035-dell300x  4.15.0-1035.40
  linux-image-4.15.0-1087-oracle  4.15.0-1087.95
  linux-image-4.15.0-1107-kvm     4.15.0-1107.109
  linux-image-4.15.0-1116-gcp     4.15.0-1116.130
  linux-image-4.15.0-1120-snapdragon  4.15.0-1120.129
  linux-image-4.15.0-1131-azure   4.15.0-1131.144
  linux-image-4.15.0-169-generic  4.15.0-169.177
  linux-image-4.15.0-169-generic-lpae  4.15.0-169.177
  linux-image-4.15.0-169-lowlatency  4.15.0-169.177
  linux-image-aws-lts-18.04       4.15.0.1121.124
  linux-image-azure-lts-18.04     4.15.0.1131.104
  linux-image-dell300x            4.15.0.1035.37
  linux-image-gcp-lts-18.04       4.15.0.1116.135
  linux-image-generic             4.15.0.169.158
  linux-image-generic-lpae        4.15.0.169.158
  linux-image-kvm                 4.15.0.1107.103
  linux-image-lowlatency          4.15.0.169.158
  linux-image-oracle-lts-18.04    4.15.0.1087.97
  linux-image-snapdragon          4.15.0.1120.123
  linux-image-virtual             4.15.0.169.158

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1087-oracle  4.15.0-1087.95~16.04.1
  linux-image-4.15.0-1116-gcp     4.15.0-1116.130~16.04.1
  linux-image-4.15.0-1131-azure   4.15.0-1131.144~16.04.1
  linux-image-4.15.0-169-generic  4.15.0-169.177~16.04.1
  linux-image-4.15.0-169-lowlatency  4.15.0-169.177~16.04.1
  linux-image-aws-hwe             4.15.0.1120.111
  linux-image-azure               4.15.0.1131.122
  linux-image-gcp                 4.15.0.1116.117
  linux-image-generic-hwe-16.04   4.15.0.169.161
  linux-image-gke                 4.15.0.1116.117
  linux-image-lowlatency-hwe-16.04  4.15.0.169.161
  linux-image-oem                 4.15.0.169.161
  linux-image-oracle              4.15.0.1087.75
  linux-image-virtual-hwe-16.04   4.15.0.169.161

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1131-azure   4.15.0-1131.144~14.04.1
  linux-image-azure               4.15.0.1131.104

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-5298-1
  CVE-2021-22600, CVE-2021-28711, CVE-2021-28712, CVE-2021-28713,
  CVE-2021-28714, CVE-2021-28715, CVE-2021-39685, CVE-2021-4083,
  CVE-2021-4155, CVE-2021-4202, CVE-2022-0330, CVE-2022-22942

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-169.177
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1121.129
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1131.144
  https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1035.40
  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1116.130
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1107.109
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1087.95
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1120.129