A new release of the Ubuntu Cloud Images for stable Ubuntu release 16.04 LTS (Xenial Xerus) is available at [1]. These new images superseded the existing images [2]. Images are available for download or immediate use on EC2 via publish AMI ids. Users who wish to update their existing installations can do so with:
   'sudo apt-get update && sudo apt-get dist-upgrade && sudo reboot'.

The following packages have been updated. Please see the full changelogs
for a complete listing of changes:
 * linux-meta: 4.4.0.198.204 => 4.4.0.200.206 
 * linux-signed: 4.4.0-198.230 => 4.4.0-200.232 
 * tar: 1.28-2.1ubuntu0.1 => 1.28-2.1ubuntu0.2 


The following is a complete changelog for this image.
new: {'linux-headers-4.4.0-200': '4.4.0-200.232', 'linux-headers-4.4.0-200-generic': '4.4.0-200.232', 'linux-modules-4.4.0-200-generic': '4.4.0-200.232'}
removed: {'linux-headers-4.4.0-198-generic': '4.4.0-198.230', 'linux-headers-4.4.0-198': '4.4.0-198.230', 'linux-modules-4.4.0-198-generic': '4.4.0-198.230'}
changed: ['linux-headers-generic', 'linux-headers-virtual', 'linux-image-4.4.0-200-generic', 'linux-image-virtual', 'linux-virtual', 'tar']
new snaps: {}
removed snaps: {}
changed snaps: []
==== linux-meta: 4.4.0.198.204 => 4.4.0.200.206 ====
====     linux-headers-generic linux-headers-virtual linux-image-virtual linux-virtual
  * Bump ABI 4.4.0-200
  * Bump ABI 4.4.0-199
==== linux-signed: 4.4.0-198.230 => 4.4.0-200.232 ====
====     linux-image-4.4.0-200-generic
  * Master version: 4.4.0-200.232
  * Master version: 4.4.0-199.231
==== tar: 1.28-2.1ubuntu0.1 => 1.28-2.1ubuntu0.2 ====
====     tar
  * SECURITY UPDATE: Infinite read loop
    - debian/patches/Fix-CVE-2018-20482.patch: Add handling for short read
      condition in sparse_dump_region() of src/sparse.c.
    - CVE-2018-20482
  * SECURITY UPDATE: NULL pointer dereference
    - debian/patches/CVE-2019-9923.patch: Check for NULL return value from
      find_next_block in src/sparse.c.
    - CVE-2019-9923 

--
[1] http://cloud-images.ubuntu.com/releases/xenial/release-20210115/
[2] http://cloud-images.ubuntu.com/releases/xenial/release-20210112/