A new release of the Ubuntu Cloud Images for stable Ubuntu release 18.04 LTS (Bionic Beaver) 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 These new images superseded the existing images [2].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: 4.15.0.134.121 => 4.15.0.135.122 
 * linux-signed: 4.15.0-134.138 => 4.15.0-135.139 
 * lshw: 02.18-0.1ubuntu6.18.04.1 => 02.18-0.1ubuntu6.18.04.2 
 * netplan.io: 0.99-0ubuntu3~18.04.3 => 0.99-0ubuntu3~18.04.4 
 * sudo: 1.8.21p2-3ubuntu1.3 => 1.8.21p2-3ubuntu1.4 
 * tzdata: 2020f-0ubuntu0.18.04 => 2021a-0ubuntu0.18.04 


The following is a complete changelog for this image.
new: {'linux-headers-4.15.0-135-generic': '4.15.0-135.139', 'linux-headers-4.15.0-135': '4.15.0-135.139', 'linux-modules-4.15.0-135-generic': '4.15.0-135.139'}
removed: {'linux-headers-4.15.0-134': '4.15.0-134.138', 'linux-modules-4.15.0-134-generic': '4.15.0-134.138', 'linux-headers-4.15.0-134-generic': '4.15.0-134.138'}
changed: ['libnetplan0:amd64', 'linux-headers-generic', 'linux-headers-virtual', 'linux-image-4.15.0-135-generic', 'linux-image-virtual', 'linux-virtual', 'lshw', 'netplan.io', 'nplan', 'sudo', 'tzdata']
new snaps: {}
removed snaps: {}
changed snaps: []
==== linux-meta: 4.15.0.134.121 => 4.15.0.135.122 ====
====     linux-headers-generic linux-headers-virtual linux-image-virtual linux-virtual
  * Bump ABI 4.15.0-135
==== linux-signed: 4.15.0-134.138 => 4.15.0-135.139 ====
====     linux-image-4.15.0-135-generic
  * Master version: 4.15.0-135.139
==== lshw: 02.18-0.1ubuntu6.18.04.1 => 02.18-0.1ubuntu6.18.04.2 ====
====     lshw
  * Backported patches for NMVe support (LP: #1826737):
    - d/p/lp1826737-code-clean-up.patch
    - d/p/lp1826737-implement-NVMe-scanning.patch
    - d/p/lp1826737-align-physical-ID-with-NVMe-namespace.patch
    - d/p/lp1826737-treat-NVMe-namespaces-like-disks.patch
==== netplan.io: 0.99-0ubuntu3~18.04.3 => 0.99-0ubuntu3~18.04.4 ====
====     libnetplan0:amd64 netplan.io nplan
  * d/p/0001-Don-t-fail-if-same-primary-slave-was-set-before-LP-1.patch
    - Fix primary slave on the bond not getting set (LP: #1817651)
==== sudo: 1.8.21p2-3ubuntu1.3 => 1.8.21p2-3ubuntu1.4 ====
====     sudo
  * SECURITY UPDATE: dir existence issue via sudoedit race
    - debian/patches/CVE-2021-23239.patch: fix potential directory existing
      info leak in sudoedit in src/sudo_edit.c.
    - CVE-2021-23239
  * SECURITY UPDATE: heap-based buffer overflow
    - debian/patches/CVE-2021-3156-pre1.patch: check lock record size in
      plugins/sudoers/timestamp.c.
    - debian/patches/CVE-2021-3156-pre2.patch: sanity check size when
      converting the first record to TS_LOCKEXCL in
      plugins/sudoers/timestamp.c.
    - debian/patches/CVE-2021-3156-1.patch: reset valid_flags to
      MODE_NONINTERACTIVE for sudoedit in src/parse_args.c.
    - debian/patches/CVE-2021-3156-2.patch: add sudoedit flag checks in
      plugin in plugins/sudoers/policy.c.
    - debian/patches/CVE-2021-3156-3.patch: fix potential buffer overflow
      when unescaping backslashes in plugins/sudoers/sudoers.c.
    - debian/patches/CVE-2021-3156-4.patch: fix the memset offset when
      converting a v1 timestamp to TS_LOCKEXCL in
      plugins/sudoers/timestamp.c.
    - debian/patches/CVE-2021-3156-5.patch: don't assume that argv is
      allocated as a single flat buffer in src/parse_args.c.
    - CVE-2021-3156
  * debian/control: added tzdata to Build-Depends so that the time zone
    data directory is present during builds.
==== tzdata: 2020f-0ubuntu0.18.04 => 2021a-0ubuntu0.18.04 ====
====     tzdata
  * New upstream version (LP: #1913482), affecting the following future timestamp:
    - South Sudan changes from +03 to +02 on 2021-02-01 at 00:00.

--
[1] http://cloud-images.ubuntu.com/releases/bionic/release-20210129/
[2] http://cloud-images.ubuntu.com/releases/bionic/release-20210125/