==========================================================================
Ubuntu Security Notice USN-5136-1
November 09, 2021

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
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-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-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:

It was discovered that the f2fs file system in the Linux kernel did not
properly validate metadata in some situations. An attacker could use this
to construct a malicious f2fs image that, when mounted and operated on,
could cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-19449)

It was discovered that the FUSE user space file system implementation in
the Linux kernel did not properly handle bad inodes in some situations. A
local attacker could possibly use this to cause a denial of service.
(CVE-2020-36322)

It was discovered that the Infiniband RDMA userspace connection manager
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 possible execute arbitrary code.
(CVE-2020-36385)

Ilja Van Sprundel discovered that the SCTP implementation in the Linux
kernel did not properly perform size validations on incoming packets in
some situations. An attacker could possibly use this to expose sensitive
information (kernel memory). (CVE-2021-3655)

It was discovered that the Qualcomm IPC Router protocol implementation in
the Linux kernel did not properly validate metadata in some situations. A
local attacker could use this to cause a denial of service (system crash)
or expose sensitive information. (CVE-2021-3743)

It was discovered that the virtual terminal (vt) device implementation in
the Linux kernel contained a race condition in its ioctl handling that led
to an out-of-bounds read vulnerability. A local attacker could possibly use
this to expose sensitive information. (CVE-2021-3753)

It was discovered that the Linux kernel did not properly account for the
memory usage of certain IPC objects. A local attacker could use this to
cause a denial of service (memory exhaustion). (CVE-2021-3759)

Michael Wakabayashi discovered that the NFSv4 client implementation in the
Linux kernel did not properly order connection setup operations. An
attacker controlling a remote NFS server could use this to cause a denial
of service on the client. (CVE-2021-38199)

It was discovered that the Aspeed Low Pin Count (LPC) Bus Controller
implementation in the Linux kernel did not properly perform boundary checks
in some situations, allowing out-of-bounds write access. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. In Ubuntu, this issue only affected systems running
armhf kernels. (CVE-2021-42252)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1030-dell300x  4.15.0-1030.35
  linux-image-4.15.0-1083-oracle  4.15.0-1083.91
  linux-image-4.15.0-1098-raspi2  4.15.0-1098.104
  linux-image-4.15.0-1102-kvm     4.15.0-1102.104
  linux-image-4.15.0-1111-gcp     4.15.0-1111.125
  linux-image-4.15.0-1115-aws     4.15.0-1115.122
  linux-image-4.15.0-1115-snapdragon  4.15.0-1115.124
  linux-image-4.15.0-1126-azure   4.15.0-1126.139
  linux-image-4.15.0-162-generic  4.15.0-162.170
  linux-image-4.15.0-162-generic-lpae  4.15.0-162.170
  linux-image-4.15.0-162-lowlatency  4.15.0-162.170
  linux-image-aws-lts-18.04       4.15.0.1115.118
  linux-image-azure-lts-18.04     4.15.0.1126.99
  linux-image-dell300x            4.15.0.1030.32
  linux-image-gcp-lts-18.04       4.15.0.1111.130
  linux-image-generic             4.15.0.162.151
  linux-image-generic-lpae        4.15.0.162.151
  linux-image-kvm                 4.15.0.1102.98
  linux-image-lowlatency          4.15.0.162.151
  linux-image-oracle-lts-18.04    4.15.0.1083.93
  linux-image-raspi2              4.15.0.1098.96
  linux-image-snapdragon          4.15.0.1115.118
  linux-image-virtual             4.15.0.162.151

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1083-oracle  4.15.0-1083.91~16.04.1
  linux-image-4.15.0-1115-aws     4.15.0-1115.122~16.04.1
  linux-image-4.15.0-1126-azure   4.15.0-1126.139~16.04.1
  linux-image-4.15.0-162-generic  4.15.0-162.170~16.04.1
  linux-image-4.15.0-162-lowlatency  4.15.0-162.170~16.04.1
  linux-image-aws-hwe             4.15.0.1115.105
  linux-image-azure               4.15.0.1126.117
  linux-image-generic-hwe-16.04   4.15.0.162.155
  linux-image-lowlatency-hwe-16.04  4.15.0.162.155
  linux-image-oem                 4.15.0.162.155
  linux-image-oracle              4.15.0.1083.71
  linux-image-virtual-hwe-16.04   4.15.0.162.155

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1126-azure   4.15.0-1126.139~14.04.1
  linux-image-azure               4.15.0.1126.99

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-5136-1
  CVE-2019-19449, CVE-2020-36322, CVE-2020-36385, CVE-2021-3655,
  CVE-2021-3743, CVE-2021-3753, CVE-2021-3759, CVE-2021-38199,
  CVE-2021-42252

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-162.170
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1115.122
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1126.139
  https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1030.35
  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1111.125
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1102.104
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1083.91
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1098.104
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1115.124