This update for ovmf fixes the following issues: Security issues fixed: - CVE-2018-12180: Fixed a buffer overflow in BlockIo service, which could lead to memory read/write overrun . - CVE-2018-12178: Fixed an improper DNS check upon receiving a new DNS packet . - CVE-2018-3630: Fixed a logic error in FV parsing which could allow a local attacker to bypass the chain of trust checks .