grub2 is vulnerable to denial of service (DoS). The vulnerability exists as an integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow.
lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
access.redhat.com/errata/RHSA-2020:3223
access.redhat.com/security/updates/classification/#moderate
access.redhat.com/security/vulnerabilities/grub2bootloader
bugzilla.redhat.com/show_bug.cgi?id=1852022
security.gentoo.org/glsa/202104-05
security.netapp.com/advisory/ntap-20200731-0008/
usn.ubuntu.com/4432-1/