{
  "cveId": "CVE-2021-28712",
  "url": "https://patchblox.com/security/cve/CVE-2021-28712",
  "summary": "CVE-2021-28712 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-28712, released January 5, 2022. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVE...",
  "description": "Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as \u0022driver domains\u0022. Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn\u0027t have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713",
  "published": "2022-01-05T17:15:09Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
  "epss": 0.00357,
  "epssPercentile": 0.29624,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-28712",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-28712",
      "released": "2022-01-05T17:15:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-28712",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-28712",
      "released": "2022-01-05T17:15:09Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.15.15-1",
      "fix": "DEBIAN-CVE-2021-28712",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-28712",
      "released": "2022-01-05T17:15:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}