An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. DMA attacks on the VariableRuntimeDxe shared buffer used by SMM and non-SMM code could cause TOCTOU race-condition issues that could lead to corruption of SMRAM and escalation of privileges. This issue was fixed in the kernel, which also protected chipset and OEM chipset code.
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) | 5.2.05.27.27 (excluding) |
| Insydeh2o | Insyde | 5.3 (including) | 5.3.05.36.27 (excluding) |
| Insydeh2o | Insyde | 5.4 (including) | 5.4.05.44.27 (excluding) |
| Insydeh2o | Insyde | 5.5 (including) | 5.5.05.52.27 (excluding) |