A Linux kernel security update has been released for Ubuntu Linux 16.04 ESM and 18.04 LTS.

USN-5357-1: Linux kernel vulnerability

=========================================================================
Ubuntu Security Notice USN-5357-1
March 31, 2022

linux, linux-aws, linux-azure-4.15, linux-dell300x, linux-hwe, linux-kvm,
linux-snapdragon vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

The system could be made to crash or run programs as an administrator.

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-kvm: Linux kernel for cloud environments
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the IPsec implementation in the Linux
kernel did not properly allocate enough memory when performing ESP
transformations, leading to a heap-based buffer overflow. A local
attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1040-dell300x 4.15.0-1040.45
linux-image-4.15.0-1112-kvm 4.15.0-1112.115
linux-image-4.15.0-1125-snapdragon 4.15.0-1125.134
linux-image-4.15.0-1126-aws 4.15.0-1126.135
linux-image-4.15.0-1136-azure 4.15.0-1136.149
linux-image-4.15.0-175-generic 4.15.0-175.184
linux-image-4.15.0-175-generic-lpae 4.15.0-175.184
linux-image-4.15.0-175-lowlatency 4.15.0-175.184
linux-image-aws-lts-18.04 4.15.0.1126.129
linux-image-azure-lts-18.04 4.15.0.1136.109
linux-image-dell300x 4.15.0.1040.42
linux-image-generic 4.15.0.175.164
linux-image-generic-lpae 4.15.0.175.164
linux-image-kvm 4.15.0.1112.108
linux-image-lowlatency 4.15.0.175.164
linux-image-snapdragon 4.15.0.1125.128
linux-image-virtual 4.15.0.175.164

Ubuntu 16.04 ESM:
linux-image-4.15.0-175-generic 4.15.0-175.184~16.04.1
linux-image-4.15.0-175-lowlatency 4.15.0-175.184~16.04.1
linux-image-generic-hwe-16.04 4.15.0.175.167
linux-image-lowlatency-hwe-16.04 4.15.0.175.167
linux-image-oem 4.15.0.175.167
linux-image-virtual-hwe-16.04 4.15.0.175.167

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-5357-1
CVE-2022-27666

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-175.184
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1126.135
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1136.149
  https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1040.45
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1112.115
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1125.134