CVE-2022-35408: Insyde INSYDEH2O

High severity, CVSS 8.2. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. An SMM callout vulnerability in the SMM driver in UsbLegacyControlSmm leads to possible arbitrary code execution in SMM and escalation of privileges. An attacker could overwrite the function pointers in the EFI_BOOT_SERVICES table before the USB SMI handler triggers. (This is not exploitable from code running in the operating system.)

Affected products

• Insyde INSYDEH2O: from 5.1, before 5.17.38 (fixed in 5.17.38); from 5.2, before 05.27.28 (fixed in 05.27.28); from 5.3, before 05.36.28 (fixed in 05.36.28); from 5.4, before 05.44.28 (fixed in 05.44.28); from 5.5, before 05.52.28 (fixed in 05.52.28); from 5.0, before 05.09.38 (fixed in 05.09.38)

Published 2022-09-22. Last modified 2026-06-17.