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It was discovered that a specially crafted file system image could cause a
heap-based out-of-bounds write. A local attacker could potentially use this
to perform arbitrary code execution bypass and bypass secure boot
protections. (CVE-2023-4692)
It was discovered that a specially crafted file system image could cause an
out-of-bounds read. A physically-present attacker could possibly use this
to leak sensitive information to the GRUB pager. (CVE-2023-4693)