CVE-2024-52877: Insyde INSYDEH2O

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

An issue was discovered in Insyde InsydeH2O kernel 5.2 before version 05.29.50, kernel 5.3 before version 05.38.50, kernel 5.4 before version 05.46.50, kernel 5.5 before version 05.54.50, kernel 5.6 before version 05.61.50, and kernel 5.7 before version 05.70.50. In VariableRuntimeDxe driver, callback function SmmCreateVariableLockList () calls CreateVariableLockListInSmm (). In CreateVariableLockListInSmm (), it uses StrSize () to get variable name size and it could lead to a buffer over-read.

Affected products

• Insyde INSYDEH2O: from 5.2, before 5.2.05.29.50 (fixed in 5.2.05.29.50); from 5.3, before 5.3.05.38.50 (fixed in 5.3.05.38.50); from 5.4, before 5.4.05.46.50 (fixed in 5.4.05.46.50); from 5.5, before 5.5.05.54.50 (fixed in 5.5.05.54.50); from 5.6, before 5.6.05.61.50 (fixed in 5.6.05.61.50); from 5.7, before 5.7.05.70.50 (fixed in 5.7.05.70.50)

Published 2025-05-15. Last modified 2026-06-17.