DMA transactions which are targeted at input buffers used for the AhciBusDxe software SMI handler could cause SMRAM corruption (a TOCTOU attack). DMA transactions which are targeted at input buffers used for the software SMI handler used by the AhciBusDxe driver could cause SMRAM corruption through a TOCTOU attack. This issue was discovered by Insyde engineering based on the general description provided by Intels iSTARE group, Fixed in kernel 5.2: 05.27.23, kernel 5.3: 05.36.23, kernel 5.4: 05.44.23, kernel 5.5: 05.52.23 https://www.insyde.com/security-pledge/SA-2022047
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 |
|---|---|---|---|
| Kernel | Insyde | 5.2 (including) | 5.2.05.27.23 (excluding) |
| Kernel | Insyde | 5.3 (including) | 5.3.05.36.23 (excluding) |
| Kernel | Insyde | 5.4 (including) | 5.4.05.44.23 (excluding) |
| Kernel | Insyde | 5.5 (including) | 5.5.05.52.23 (excluding) |