A significant vulnerability in Ubuntu 25.04 allows attackers with physical access to bypass Secure Boot protections by exploiting debug shells in the initramfs during boot failures. This enables persistent malware injection that survives reboots and maintains access even after correct password entry for encrypted partitions. The attack involves injecting malicious hooks into the initramfs, circumventing traditional security measures. Mitigations include modifying kernel parameters to disable debug shells and implementing advanced encryption methods.