A memory corruption vulnerability in HddPassword in Insyde InsydeH2O kernel 5.2 before 05.29.09, kernel 5.3 before 05.38.09, kernel 5.4 before 05.46.09, kernel 5.5 before 05.54.09, and kernel 5.6 before 05.61.09 could lead to escalating privileges in SMM.
An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. There is an SMM memory corruption vulnerability in the Software SMI handler in the PnpSmm driver.