The CMU CERT Coordination Center has put out an advisory that many
exploitable versions of the shim binary, used to boot Linux on systems with
UEFI secure boot enabled, were never added to the revocation list.

An attacker with administrative privileges or the ability to modify
	the boot process could use one of the vulnerable shim bootloaders
	to bypass Secure Boot protections and execute arbitrary code before
	the operating system loads. Code executed during this early boot
	phase may achieve persistent compromise of the platform, including
	the ability to load unsigned or malicious kernel components that
	can survive system reboots and, in some cases, operating system
	reinstallation.

The advisory contains a list of vulnerable shims.

https://lwn.net/Articles/1082940/
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