This update for ovmf fixes the following issues: Security issues fixed: - CVE-2018-3613: Fixed AuthVariable Timestamp zeroing issue on APPEND_WRITE . - CVE-2017-5731: Fixed privilege escalation via processing of malformed files in TianoCompress.c . - CVE-2017-5732: Fixed privilege escalation via processing of malformed files in BaseUefiDecompressLib.c . - CVE-2017-5733: Fixed privilege escalation via heap-based buffer overflow in MakeTable function . - CVE-2017-5734: Fixed privilege escalation via stack-based buffer overflow in MakeTable function . - CVE-2017-5735: Fixed privilege escalation via heap-based buffer overflow in Decode function .