CVEvulnerability

CVE-2021-28702

7.6 HIGH Published 2021-10-06 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-10-06
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.6 HIGH — CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0 ([email protected])
4.6 MEDIUM — AV:L/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-269

Description

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.

Affected configurations

• xen xen (>= 4.13.0 <= 4.15.1) • fedoraproject fedora 33 • fedoraproject fedora 34 • fedoraproject fedora 35 • debian debian linux 9.0

Related

Weakness · CWE (1)

  • CWE-269 Improper Privilege Management weakness

References