{
  "cveId": "CVE-2021-47111",
  "url": "https://patchblox.com/security/cve/CVE-2021-47111",
  "summary": "CVE-2021-47111 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47111, released March 15, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  xen-netback: take a reference to the RX task thr...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xen-netback: take a reference to the RX task thread  Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97f4.  Reintroduce the reference taking and add a comment this time explaining why it\u0027s needed.  This is XSA-374 / CVE-2021-28691.",
  "published": "2024-03-15T21:15:06Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00237,
  "epssPercentile": 0.1476,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47111",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47111",
      "released": "2024-03-15T21:15:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47111",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47111",
      "released": "2024-03-15T21:15:06Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47111",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47111",
      "released": "2024-03-15T21:15:06Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}