Aviso de bug com atualização do aptitude #1019855 e #1019564

Eu tento atualizar um Debian Bullseye, mas recebo uma mensagem de aviso ansiosa:

 % sudo aptitude upgrade
Resolving dependencies...
The following NEW packages will be installed:
  linux-headers-5.10.0-18-amd64{a} linux-headers-5.10.0-18-common{a} linux-image-5.10.0-18-amd64{a}
The following packages will be REMOVED:
  sse3-support{u}
The following packages will be upgraded:
  avahi-autoipd avahi-daemon base-files bind9-dnsutils bind9-host bind9-libs chromium chromium-common chromium-sandbox clamav clamav-base clamav-freshclam cri-tools curl dpkg dpkg-dev
  fig2dev firefox-esr firefox-esr-l10n-fr fonts-opensymbol gir1.2-ayatanaappindicator3-0.1 gir1.2-gdkpixbuf-2.0 gir1.2-javascriptcoregtk-4.0 gir1.2-lokdocview-0.1 gir1.2-webkit2-4.0
  gping grub-common grub-pc grub-pc-bin grub2-common krb5-locales kubeadm kubectl kubelet kubernetes-cni libavahi-client3 libavahi-common-data libavahi-common3 libavahi-compat-libdnssd1
  libavahi-core7 libavahi-glib1 libayatana-appindicator1 libayatana-appindicator3-1 libc-bin libc-dev-bin libc-devtools libc-l10n libc6 libc6-dev libclamav9 libcurl3-gnutls libcurl4
  libdatetime-timezone-perl libdpkg-perl libexpat1 libexpat1-dev libgdk-pixbuf-2.0-0 libgdk-pixbuf-2.0-dev libgdk-pixbuf2.0-bin libgdk-pixbuf2.0-common libgssapi-krb5-2
  libhttp-daemon-perl libhttp-parser2.9 libjavascriptcoregtk-4.0-18 libjs-bootstrap4 libjuh-java libjurt-java libk5crypto3 libkrb5-3 libkrb5support0 liblibreoffice-java
  liblibreofficekitgtk libnss-myhostname libnss-systemd libpam-systemd libpcre2-16-0 libpcre2-32-0 libpcre2-8-0 libpcre2-dev libpcre2-posix2 libpoppler-cpp0v5 libpoppler-glib8
  libpoppler-qt5-1 libpoppler102 libpq5 libreoffice-base-core libreoffice-calc libreoffice-common libreoffice-core libreoffice-draw libreoffice-gnome libreoffice-gtk3
  libreoffice-help-common libreoffice-help-en-us libreoffice-help-fr libreoffice-impress libreoffice-l10n-fr libreoffice-math libreoffice-style-colibre libreoffice-style-elementary
  libreoffice-writer libreofficekit-data libridl-java libsystemd0 libudev1 libuno-cppu3 libuno-cppuhelpergcc3-3 libuno-purpenvhelpergcc3-3 libuno-sal3 libuno-salhelpergcc3-3
  libunoloader-java libwebkit2gtk-4.0-37 libxnvctrl0 libxslt1.1 linux-compiler-gcc-10-x86 linux-headers-amd64 linux-image-amd64 linux-kbuild-5.10 linux-libc-dev locales poppler-utils
  publicsuffix python3-uno systemd systemd-sysv systemd-timesyncd thunderbird tzdata udev uno-libs-private ure virtualbox virtualbox-dkms virtualbox-qt zlib1g zlib1g-dev
The following packages are RECOMMENDED but will NOT be installed:
  libnss-nis libnss-nisplus
136 packages upgraded, 3 newly installed, 1 to remove and 0 not upgraded.
Need to get 0 B/540 MB of archives. After unpacking 400 MB will be used.
Do you want to continue? [Y/n/?] y
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
critical bugs of libc6 (2.31-13+deb11u3 -> 2.31-13+deb11u4) <Outstanding>
 b1 - #1019855 - Fwd: libc6: immediately crashes with SIGILL on 4th gen Intel Core CPUs (seems related to AVX2 instructions), bricking the whole system
grave bugs of grub-pc (2.04-20 -> 2.06-3~deb11u2) <Outstanding>
 b2 - #1019564 - (during upgrade) grub-install: warning: Attempting to install GRUB to a disk with multiple partition labels.  This is not supported yet..
Summary:
 libc6(1 bug), grub-pc(1 bug)
Are you sure you want to install/upgrade the above packages? [Y/n/?/...]

Então, qual é o problema com libc6 e grub-pc, o problema é tão perigoso quanto o apt tell? O que concretamente pode acontecer? A propósito, posso dizer “sim” e continuar?