USN-6410-1: GRUB2 vulnerabilities

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)

arbitrary code attacker boot bypass code code execution cve file file system grub2 image local out-of-bounds out-of-bounds write secure boot system usn vulnerabilities