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, SecureBootHandler uses DataSize and VariableNameSize when determining if the data or name are in the buffer, but these are supplied by the caller and therefore cannot be trusted.
A memory corruption vulnerability in StorageSecurityCommandDxe in Insyde InsydeH2O before kernel 5.2: IB19130163 in 05.29.07, kernel 5.3: IB19130163 in 05.38.07, kernel 5.4: IB19130163 in 05.46.07, kernel 5.5: IB19130163 in 05.54.07, and kernel 5.6: IB19130163 in 05.61.07 could lead to escalating privileges in SMM.