{
  "cveId": "CVE-2021-28706",
  "url": "https://patchblox.com/security/cve/CVE-2021-28706",
  "summary": "CVE-2021-28706 is fixed in xen on 1 platform, first by DEBIAN-CVE-2021-28706, released November 24, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "xen: guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be...",
  "description": "guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.",
  "published": "2021-11-24T01:15:08Z",
  "severity": "high",
  "cvss": 8.6,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
  "epss": 0.02233,
  "epssPercentile": 0.82884,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "4.14.3\u002B32-g9de3671772-1",
      "fix": "DEBIAN-CVE-2021-28706",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-28706",
      "released": "2021-11-24T01:15:08Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.14.3\u002B32-g9de3671772-1",
      "fix": "DEBIAN-CVE-2021-28706",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-28706",
      "released": "2021-11-24T01:15:08Z"
    },
    {
      "platform": "linux",
      "product": "xen",
      "release": "Debian 14",
      "fixedVersion": "4.14.3\u002B32-g9de3671772-1",
      "fix": "DEBIAN-CVE-2021-28706",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-28706",
      "released": "2021-11-24T01:15:08Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}