CVE-2023-22615: Insyde INSYDEH2O

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

An issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5. IHISI subfunction execution may corrupt SMRAM. 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.

Affected products

• Insyde INSYDEH2O: version 05.37.03 only; version 05.45.01 only; version 05.53.01 only

Published 2023-04-11. Last modified 2026-06-17.