A new release of the Ubuntu Cloud Images for stable Ubuntu release 21.04 (Hirsute Hippo) 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 These new images superseded the existing images [2].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:
 * icu: 67.1-6ubuntu2 => 67.1-6ubuntu2.1 
 * linux-meta: 5.11.0.40.41 => 5.11.0.41.42 
 * linux-signed: 5.11.0-40.44 => 5.11.0-41.45 


The following is a complete changelog for this image.
new: {'linux-headers-5.11.0-41-generic': '5.11.0-41.45', 'linux-headers-5.11.0-41': '5.11.0-41.45', 'linux-modules-5.11.0-41-generic': '5.11.0-41.45'}
removed: {'linux-modules-5.11.0-40-generic': '5.11.0-40.44', 'linux-headers-5.11.0-40': '5.11.0-40.44', 'linux-headers-5.11.0-40-generic': '5.11.0-40.44'}
changed: ['libicu67:amd64', 'linux-headers-generic', 'linux-headers-virtual', 'linux-image-5.11.0-41-generic', 'linux-image-virtual', 'linux-virtual']
new snaps: {}
removed snaps: {}
changed snaps: ['snapd']
==== icu: 67.1-6ubuntu2 => 67.1-6ubuntu2.1 ====
====     libicu67:amd64
  * SECURITY UPDATE: Double Free
    - debian/patches/CVE-2021-30535-prereq.patch: Fix invalid free when
      using long locale name in Locale functions in
      source/common/locid.cpp.
    - debian/patches/CVE-2021-30535.patch: Fix edge cases with baseName
      in setKeywordValue function in source/common/locid.cpp to
      prevent double free and protect from heap corruption.
    - CVE-2021-30535
  * fix failing tests causing build-time failure: (LP: #1951432)
    - debian/patches/tzdata-2021b-tests.patch: Fix TestCalendar function
      in source/test/cintltst/ccaltst.c and TestGenericAPI in
      source/test/intltest/tztest.cpp to accept tz.version with longer
      string size to prevent tests from failing.
    - debian/patches/skip-tztests.patch: Skip specific Time Zones tests in
      TestAliasedNames and TestCanonicalID functions in
      source/test/intltest/tztest.cpp. They don't match with data from
      updated tzdata and needed to be skiped to prevent tests from failing.
==== linux-meta: 5.11.0.40.41 => 5.11.0.41.42 ====
====     linux-headers-generic linux-headers-virtual linux-image-virtual linux-virtual
  * Bump ABI 5.11.0-41
  * Packaging resync (LP: #1786013)
    - [Packaging] resync debian/dkms-versions from main package
==== linux-signed: 5.11.0-40.44 => 5.11.0-41.45 ====
====     linux-image-5.11.0-41-generic
  * Master version: 5.11.0-41.45

--
[1] http://cloud-images.ubuntu.com/releases/hirsute/release-20211130/
[2] http://cloud-images.ubuntu.com/releases/hirsute/release-20211119/