==========================================================================
Ubuntu Security Notice USN-5413-1
May 12, 2022

linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- 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-kvm: Linux kernel for cloud environments
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Jeremy Cline discovered a use-after-free in the nouveau graphics driver
of the Linux kernel during device removal. A privileged or physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2020-27820)

It was discovered that a race condition existed in the network scheduling
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-2021-39713)

It was discovered that the Parallel NFS (pNFS) implementation in the Linux
kernel did not properly perform bounds checking in some situations. An
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2021-4157)

It was discovered that the ST21NFCA NFC driver in the Linux kernel did not
properly validate the size of certain data in EVT_TRANSACTION events. A
physically proximate attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-26490)

It was discovered that the Xilinx USB2 device gadget driver in the Linux
kernel did not properly validate endpoint indices from the host. A
physically proximate attacker could possibly use this to cause a denial of
service (system crash). (CVE-2022-27223)

It was discovered that the EMS CAN/USB interface implementation in the
Linux kernel contained a double-free vulnerability when handling certain
error conditions. A local attacker could use this to cause a denial of
service (memory exhaustion). (CVE-2022-28390)

Update instructions:

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

Ubuntu 16.04 ESM:
  linux-image-4.4.0-1105-kvm      4.4.0-1105.114
  linux-image-4.4.0-1140-aws      4.4.0-1140.154
  linux-image-4.4.0-224-generic   4.4.0-224.257
  linux-image-4.4.0-224-lowlatency  4.4.0-224.257
  linux-image-aws                 4.4.0.1140.145
  linux-image-generic             4.4.0.224.231
  linux-image-kvm                 4.4.0.1105.103
  linux-image-lowlatency          4.4.0.224.231
  linux-image-virtual             4.4.0.224.231

Ubuntu 14.04 ESM:
  linux-image-4.4.0-224-generic   4.4.0-224.257~14.04.1
  linux-image-4.4.0-224-lowlatency  4.4.0-224.257~14.04.1
  linux-image-generic-lts-xenial  4.4.0.224.195
  linux-image-lowlatency-lts-xenial  4.4.0.224.195
  linux-image-virtual-lts-xenial  4.4.0.224.195

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-5413-1
  CVE-2020-27820, CVE-2021-39713, CVE-2021-4157, CVE-2022-26490,
  CVE-2022-27223, CVE-2022-28390