An issue was discovered in IhisiSmm in Insyde InsydeH2O with kernel 5.0 through 5.5. The IhisiDxe driver uses the command buffer to pass input and output data. By modifying the command buffer contents with DMA after the 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.
The product checks the state of a resource before using that resource, but the resource’s state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Insydeh2o | Insyde | 5.0 (including) | 5.2.05.27.37 (excluding) |
| Insydeh2o | Insyde | 5.3 (including) | 5.3.05.36.37 (excluding) |
| Insydeh2o | Insyde | 5.4 (including) | 5.4.05.44.45 (excluding) |
| Insydeh2o | Insyde | 5.5 (including) | 5.5.05.52.45 (excluding) |