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Name
CVE-2021-28702
Source
NVD ( link)Debian ( link)
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.
CWEs
CWE-269
Published Date
Updated Date
Workaround
-
Advisories
http://www.openwall.com/lists/oss-security/2021/10/07/2Mailing List
https://security.gentoo.org/glsa/202208-23Third Party Advisory
https://www.debian.org/security/2021/dsa-5017Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-386.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2021/10/07/2Mailing List
https://security.gentoo.org/glsa/202208-23Third Party Advisory
https://www.debian.org/security/2021/dsa-5017Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-386.txtVendor Advisory

Analysis#

Affected Component
Analysis
xen
Exploitable

Vulnerability Ratings#

7.6
CVSSv31
4.6
CVSSv2

Others affected component#

Name
Project
Project Version
Version
Status
xen
buildroot
master
4.19.5
Not Affected