CVE-2022-26358

IOMMU: RMRR (VT-d) and unity map (AMD-Vi) handling issues T[his CNA
information record relates to multiple CVEs; the text explains which
aspects/vulnerabilities correspond to which CVE.] Certain PCI devices in a
system might be assigned Reserved Memory Regions (specified via Reserved
Memory Region Reporting, “RMRR”) for Intel VT-d or Unity Mapping ranges for
AMD-Vi. These are typically used for platform tasks such as legacy USB
emulation. Since the precise purpose of these regions is unknown, once a
device associated with such a region is active, the mappings of these
regions need to remain continuouly accessible by the device. This
requirement has been violated. Subsequent DMA or interrupts from the device
may have unpredictable behaviour, ranging from IOMMU faults to memory
corruption.

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