CVE-2021-28702

 

Published at: - 06-10-2021 04:15

Last modified: - 15-08-2022 01:15

Total changes: - 8

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://xenbits.xenproject.org/xsa/advisory-386.txt
• [oss-security] 20211007 Xen Security Advisory 386 v2 (CVE-2021-28702) - PCI devices with RMRRs not deassigned correctly-Mailing List, Third Party Advisory
• FEDORA-2021-0b7a484688-Mailing List, Third Party Advisory
• FEDORA-2021-80bbe7def0-Mailing List, Third Party Advisory
• FEDORA-2021-829f5f2f43-Mailing List, Third Party Advisory
• DSA-5017-Third Party Advisory
• GLSA-202208-23-

 

Keywords

NVD

 

CVE-2021-28702

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures