CVE-2022-32471

Name of the Vulnerable Software and Affected Versions Insyde InsydeH2O with kernel versions 5.0 through 5.5

Description An issue was discovered in IhisiSmm where the IhisiDxe driver uses a command buffer to pass input and output data. By modifying the command buffer contents with DMA after input parameters have been checked but before they are used, the IHISI SMM code may be convinced to modify SMRAM or OS, leading to possible data corruption or escalation of privileges.

Recommendations For kernel versions 5.0 through 5.5, consider disabling the IhisiDxe driver as a temporary workaround until a patch is available. Restrict access to the command buffer to minimize the risk of exploitation. Avoid using DMA to modify the command buffer contents after input parameters have been checked.