CVE-2021-28702

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region…

published October 6, 2021

CVSS
—
EPSS
0%
Percentile
37.3
In the wild
Unconfirmed
What it is

PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region Reporting, "RMRR"). These are typically used for platform tasks such as legacy USB emulation. If such a device is passed through to a guest, then on guest shutdown the device is not properly deassigned. The IOMMU configuration for these devices which are not properly deassigned ends up pointing to a freed data structure, including the IO Pagetables. Subsequent DMA or interrupts from the device will have unpredictable behaviour, ranging from IOMMU faults to memory corruption.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00441 · 37.3th percentile
Published
2021-10-06T13:13Z
EPSS history
Timeline
  • 06 OCT 13:13Z
    PCI devices with RMRRs not deassigned correctly Certain PCI devices in a system might be assigned Reserved Memory Regions (specified via Reserved Memory Region…
    cvelistv5