{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-28692",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-28692",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-06-30T10:27:57.000Z",
    "updatedAt": "2024-08-03T21:47:33.190Z",
    "importedAt": "2026-10-24T01:56:26.894Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": null,
      "summary": "inappropriate 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.",
      "affected": [
        {
          "vendor": "Xen",
          "product": "xen",
          "versions": [
            {
              "version": "4.13.x",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Xen",
          "product": "xen",
          "versions": [
            {
              "version": "4.14.x",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Xen",
          "product": "xen",
          "versions": [
            {
              "version": "4.15.x",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Xen",
          "product": "xen",
          "versions": [
            {
              "version": "xen-unstable",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Xen",
          "product": "xen",
          "versions": [
            {
              "version": "4.12.x",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Xen",
          "product": "xen",
          "versions": [
            {
              "version": "4.11.x",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}