A new release of the Ubuntu Cloud Images for stable Ubuntu release 20.04 LTS (Focal Fossa) 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 These new images superseded the existing images [2].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:
 * alsa-ucm-conf: 1.2.2-1ubuntu0.9 => 1.2.2-1ubuntu0.10 
 * libssh: 0.9.3-2ubuntu2.1 => 0.9.3-2ubuntu2.2 
 * linux-meta: 5.4.0.81.85 => 5.4.0.84.88 
 * linux-signed: 5.4.0-81.91 => 5.4.0-84.94 
 * ntfs-3g: 1:2017.3.23AR.3-3ubuntu1 => 1:2017.3.23AR.3-3ubuntu1.1 
 * python-apt: 2.0.0ubuntu0.20.04.5 => 2.0.0ubuntu0.20.04.6 
 * squashfs-tools: 1:4.4-1 => 1:4.4-1ubuntu0.1 


The following is a complete changelog for this image.
new: {'linux-headers-5.4.0-84-generic': '5.4.0-84.94', 'linux-headers-5.4.0-84': '5.4.0-84.94', 'linux-modules-5.4.0-84-generic': '5.4.0-84.94'}
removed: {'linux-headers-5.4.0-81': '5.4.0-81.91', 'linux-modules-5.4.0-81-generic': '5.4.0-81.91', 'linux-headers-5.4.0-81-generic': '5.4.0-81.91'}
changed: ['alsa-ucm-conf', 'libntfs-3g883', 'libssh-4:amd64', 'linux-headers-generic', 'linux-headers-virtual', 'linux-image-5.4.0-84-generic', 'linux-image-virtual', 'linux-virtual', 'ntfs-3g', 'python-apt-common', 'python3-apt', 'squashfs-tools']
new snaps: {}
removed snaps: {}
changed snaps: []
==== alsa-ucm-conf: 1.2.2-1ubuntu0.9 => 1.2.2-1ubuntu0.10 ====
====     alsa-ucm-conf
  * d/p/0031-sof-soundwire-rt1316-DAC-L-and-R-is-replaced-by-DAC.patch
    The mixer name is changed in the codec driver rt1316-sdw.c, so need
    to handle the new mixer name.
    https://github.com/alsa-project/alsa-ucm-conf/pull/109
    (LP: #1937980)
  * d/p/0032-sof-hda-dsp-Set-Capture-Switch-on-in-the-BootSequenc.patch
    The input volume of the external microphone is 0 by default for all
    machines with sof audio driver, that is because the capture switch
    is set to off by default, need to set it to on in the ucm.
    https://github.com/alsa-project/alsa-ucm-conf/pull/107
    (LP: #1940788)
==== libssh: 0.9.3-2ubuntu2.1 => 0.9.3-2ubuntu2.2 ====
====     libssh-4:amd64
  * SECURITY UPDATE: possible heap-buffer overflow when rekeying
    - debian/patches/CVE-2021-3634.patch: create a separate length for
      session_id in include/libssh/crypto.h, src/gssapi.c, src/kdf.c,
      src/kex.c, src/libcrypto.c, src/messages.c, src/packet.c, src/pki.c,
      src/wrapper.c, tests/unittests/torture_session_keys.c.
    - CVE-2021-3634
==== linux-meta: 5.4.0.81.85 => 5.4.0.84.88 ====
====     linux-headers-generic linux-headers-virtual linux-image-virtual linux-virtual
  * Bump ABI 5.4.0-84
  * Bump ABI 5.4.0-83
  * Bump ABI 5.4.0-82
  * Packaging resync (LP: #1786013)
    - [Packaging] resync debian/dkms-versions from main package
==== linux-signed: 5.4.0-81.91 => 5.4.0-84.94 ====
====     linux-image-5.4.0-84-generic
  * Master version: 5.4.0-84.94
  * Master version: 5.4.0-83.93
  * Master version: 5.4.0-82.92
==== ntfs-3g: 1:2017.3.23AR.3-3ubuntu1 => 1:2017.3.23AR.3-3ubuntu1.1 ====
====     libntfs-3g883 ntfs-3g
  * SECURITY UPDATE: multiple security issues
    - debian/patches/aug2021-security.patch: backport fixes from new
      upstream version.
    - No CVE number
==== python-apt: 2.0.0ubuntu0.20.04.5 => 2.0.0ubuntu0.20.04.6 ====
====     python-apt-common python3-apt
  * Update mirror lists
==== squashfs-tools: 1:4.4-1 => 1:4.4-1ubuntu0.1 ====
====     squashfs-tools
  * SECURITY UPDATE: Directory traversal via relative paths in unsquashfs
    (LP: #1941790)
    - debian/patches/0001-CVE-2021-40153.patch:
      Treat squashfs images which contain files with names containing
      constructs like ../ as corrupted in unsquash-N.c
    - CVE-2021-40153

--
[1] http://cloud-images.ubuntu.com/releases/focal/release-20210907/
[2] http://cloud-images.ubuntu.com/releases/focal/release-20210825/