CVE-2021-28692

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Summary

CVECVE-2021-28692
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-30 11:15:00 UTC
Updated2021-07-12 14:53:00 UTC
Descriptioninappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, asynchronous notification of the completion of such commands is not used. Instead, the issuing CPU spin-waits for the completion of the most recently issued command(s). Some of these waiting loops try to apply a timeout to fail overly-slow commands. The course of action upon a perceived timeout actually being detected is inappropriate: - on Intel hardware guests which did not originally cause the timeout may be marked as crashed, - on AMD hardware higher layer callers would not be notified of the issue, making them continue as if the IOMMU operation succeeded.

Risk And Classification

Problem Types: CWE-269

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Xen Xen All All All All

References

ReferenceSourceLinkTags
Xen: Multiple vulnerabilities (GLSA 202107-30) — Gentoo security GENTOO security.gentoo.org Mitigation, Third Party Advisory
xenbits.xenproject.org/xsa/advisory-373.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

  • 178672 Debian Security Update for xen (DSA 4931-1)
  • 180206 Debian Security Update for xen (CVE-2021-28692)
  • 281644 Fedora Security Update for xen (FEDORA-2021-993693c914)
  • 281645 Fedora Security Update for xen (FEDORA-2021-41d4347447)
  • 377778 Citrix XenServer Security Updates (CTX316324)
  • 390221 Oracle Managed Virtualization (VM) Server for x86 Security Update for xen (OVMSA-2021-0020)
  • 390231 Oracle Managed Virtualization (VM) Server for x86 Security Update for xen (OVMSA-2021-0020)
  • 500800 Alpine Linux Security Update for xen
  • 501518 Alpine Linux Security Update for xen
  • 501796 Alpine Linux Security Update for xen
  • 504543 Alpine Linux Security Update for xen
  • 710038 Gentoo Linux Xen Multiple vulnerabilities (GLSA 202107-30)
  • 751074 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2925-1)
  • 751083 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2924-1)
  • 751085 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2943-1)
  • 751087 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2955-1)
  • 751100 OpenSUSE Security Update for xen (openSUSE-SU-2021:2923-1)
  • 751103 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2957-1)
  • 751111 OpenSUSE Security Update for xen (openSUSE-SU-2021:1236-1)
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