Insufficient memory write check in SMM service for EDK II may allow an authenticated user to potentially enable escalation of privilege, information disclosure and/or denial of service via local access.
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03912en_us
https://edk2-docs.gitbooks.io/security-advisory/content/sw-smi-confused-deputy-smramsavestate_c.html