A grub2 security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: grub2-2.06-9.fc34

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Fedora Update Notification
FEDORA-2021-73d63662b0
2021-12-26 01:09:10.067800
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Name : grub2
Product : Fedora 34
Version : 2.06
Release : 9.fc34
URL :   http://www.gnu.org/software/grub/
Summary : Bootloader with support for Linux, Multiboot and more
Description :

The GRand Unified Bootloader (GRUB) is a highly configurable and
customizable bootloader with modular architecture. It supports a rich
variety of kernel formats, file systems, computer architectures and
hardware devices.

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Update Information:

- restore umask for grub.cfg (CVE-2021-3981) - re-run signing after
infrastructure fix
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ChangeLog:

* Fri Dec 10 2021 Robbie Harwood - 2.06-9
- Bump to re-run signing (no code changes)
* Thu Dec 9 2021 Robbie Harwood - 2.06-8
- Restore grub.cfg umask (CVE-2021-3981)
- Resolves: rhbz#2030358
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References:

[ 1 ] Bug #2030358 - CVE-2021-3981 grub2: Incorrect permission in grub.cfg allow unprivileged user to read the file content [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=2030358
[ 2 ] Bug #2030940 - Booting with grub2-2.06-9.fc35 and UEFI Secure Boot enabled resulted in Error: Verification Failed: (0x1A) Security Violation
  https://bugzilla.redhat.com/show_bug.cgi?id=2030940
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-73d63662b0' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys
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