Insyde's Security Pledge

SMM memory corruption vulnerability allowing a possible attacker to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

CVSS Vector: AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

CVE-2021-42554

This corresponds to CVE-2021-42554. It affects the FvbServicesRuntimeDxe driver. It was reported by the Binarly efiXplorer team.

It is fixed in the following InsydeH2O kernel versions: Kernel 5.0: 05.08.42, Kernel 5.1: 05.16.42, Kernel 5.2: 05.26.42, Kernel 5.3: 05.35.42, Kernel 5.4: 05.42.51, Kernel 5.5: 05.50.51

Insyde Software would like to thank Binarly for reporting this issue.