According to user reports following this month's Patch Tuesday, the August 2024 Windows security updates are breaking dual boot on some Linux systems with Secure Boot enabled.
GRUB, a popular Linux boot loader project has fixed multiple high severity vulnerabilities.
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A severe vulnerability exists in almost all signed versions of GRUB2 bootloader used by most Linux systems. When properly exploited, it could allow threat actors to compromise an operating system's booting process even if the Secure Boot verification mechanism is active.