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.
Weakness
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.
Affected Software
| 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) |