Misaligned Page Frame Vulnerability in Xen Hypervisor Affecting Multiple Guests
CVE-2021-28704

8.8HIGH

Key Information:

Vendor

Xen Project
Status
Xen
Vendor
CVE Published:
24 November 2021

What is CVE-2021-28704?

The vulnerability in the Xen Hypervisor allows x86 hardware virtual machines (HVM) and Paravirtualized hardware (PVH) guests to operate in a populate-on-demand (PoD) mode without proper alignment checks on the base page frame number. This defect can be exploited via hypercalls that handle memory management, particularly XENMEM_decrease_reservation and XENMEM_populate_physmap. This flaw may lead to incorrect memory mapping and potential host crashes if the page order does not conform to expected values, which can severely impact system integrity and stability.

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Affected Version(s)

xen xen-unstable

xen 4.12.x

xen 4.15.x

References

https://xenbits.xenproject.org/xsa/advisory-388.txt
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisory
https://www.debian.org/security/2021/dsa-5017
vendor-advisory

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Jan Beulich of SUSE.'}]}}}
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