CVE-2021-28702

State: Published
Severity: Not scored
Published: Oct 6, 2021
Updated: Aug 3, 2024
Reserved: Mar 18, 2021

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
xenXen	before 4.12Unknown 4.12.x to before unspecifiedAffected next of xen-unstable to before unspecifiedNot affected

References

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 correctlymailing-list
FEDORA-2021-80bbe7def0vendor-advisory
FEDORA-2021-0b7a484688vendor-advisory
FEDORA-2021-829f5f2f43vendor-advisory
DSA-5017vendor-advisory
GLSA-202208-23vendor-advisory

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