CVE-2021-28710

Published on: 11/21/2021 12:00:00 AM UTC

Last Modified on: 12/10/2021 05:08:00 PM UTC

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

Certain versions of Fedora from Fedoraproject contain the following vulnerability:

certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address translation control structures (page tables) may (and, on suitable hardware, by default will) be shared between CPUs, for second-level translation (EPT), and IOMMUs. These page tables are presently set up to always be 4 levels deep. However, an IOMMU may require the use of just 3 page table levels. In such a configuration the lop level table needs to be stripped before inserting the root table's address into the hardware pagetable base register. When sharing page tables, Xen erroneously skipped this stripping. Consequently, the guest is able to write to leaf page table entries.

  • CVE-2021-28710 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo Xen - xen version ?< 4.12
  • Affected Vendor/Software: URL Logo Xen - xen version >= 4.15.x
  • Affected Vendor/Software: URL Logo Xen - xen version !> xen-unstable

CVSS3 Score: 8.8 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
LOCAL LOW LOW NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
CHANGED HIGH HIGH HIGH

CVSS2 Score: 6.9 - MEDIUM

Access
Vector
Access
Complexity
Authentication
LOCAL MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
COMPLETE COMPLETE COMPLETE

CVE References

Description Tags Link
[SECURITY] Fedora 35 Update: xen-4.15.1-4.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-03645e9807
xenbits.xenproject.org
text/plain
URL Logo MISC xenbits.xenproject.org/xsa/advisory-390.txt

Related QID Numbers

  • 282136 Fedora Security Update for xen (FEDORA-2021-03645e9807)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System
FedoraprojectFedora35AllAllAll
Operating
System
XenXen4.15.0AllAllAll
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*:
  • cpe:2.3:o:xen:xen:4.15.0:*:*:*:*:*:x86:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-28710 : certain VT-d IOMMUs may not work in shared page table mode For efficiency reasons, address transl… twitter.com/i/web/status/1… 2021-11-21 14:25:28
© CVE.report 2022 Twitter Nitter Twitter Viewer |

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