CVE-2021-28710

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Summary

CVECVE-2021-28710
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-11-21 15:15:00 UTC
Updated2023-11-07 03:32:00 UTC
Descriptioncertain 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.

Risk And Classification

Problem Types: CWE-269

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 35 All All All
Operating System Xen Xen 4.15.0 All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 35 Update: xen-4.15.1-4.fc35 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
Xen: Multiple Vulnerabilities (GLSA 202208-23) — Gentoo security GENTOO security.gentoo.org
[SECURITY] Fedora 35 Update: xen-4.15.1-4.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
xenbits.xenproject.org/xsa/advisory-390.txt MISC xenbits.xenproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Array

Legacy QID Mappings

  • 282136 Fedora Security Update for xen (FEDORA-2021-03645e9807)
  • 501799 Alpine Linux Security Update for xen
  • 502458 Alpine Linux Security Update for xen
  • 504546 Alpine Linux Security Update for xen
  • 710600 Gentoo Linux Xen Multiple Vulnerabilities (GLSA 202208-23)
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