Vulnerability Database

289,689

Total vulnerabilities in the database

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 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.

  • Published: Oct 6, 2021
  • Updated: Apr 14, 2023
  • CVE: CVE-2021-28702
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.6
  • AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v2:

  • Severity: Low
  • Score: 4.6
  • AV:L/AC:L/Au:N/C:P/I:P/A:P

CWEs: