Insyde's Security Pledge

IhisiServicesSmm: IHISI Subfunction Execution May Corrupt SMRAM.

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L

CVE-2023-22615

An attacker can pass an address in the RCX save state register that overlaps SMRAM, thereby coercing an IHISI subfunction handler to overwrite private SMRAM.

Kernel 5.3: Version 05.37.03
Kernel 5.4: Version 05.45.01
Kernel 5.5: Version 05.53.01

Insyde Software would like to thank Jeremy Boone (@uffeux) of the NCC Group for reporting the vulnerability and engaging in this coordinated disclosure.