{
  "cveId": "CVE-2021-43784",
  "url": "https://patchblox.com/security/cve/CVE-2021-43784",
  "summary": "CVE-2021-43784 is fixed in runc on 1 platform, first by DEBIAN-CVE-2021-43784, released December 6, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "runc: The runC tool is a lightweight, portable implementation of the Open Container Format (OCF) that provides container ru...",
  "description": "The runC tool is a lightweight, portable implementation of the Open Container Format (OCF) that provides container runtime.\n\nSecurity Fix(es):\n\n* golang: crypto/tls: large handshake records may cause panics (CVE-2022-41724)\n\n* runc: Rootless runc makes \u0060/sys/fs/cgroup\u0060 writable (CVE-2023-25809)\n\n* runc: volume mount race condition (regression of CVE-2019-19921) (CVE-2023-27561)\n\n* runc: AppArmor can be bypassed when \u0060/proc\u0060 inside the container is symlinked with a specific mount configuration (CVE-2023-28642)\n\n* runc: integer overflow in netlink bytemsg length field allows attacker to override netlink-based container configuration (CVE-2021-43784)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 9.3 Release Notes linked from the References section.",
  "published": "2021-12-06T18:15:08Z",
  "severity": "Moderate",
  "cvss": 5,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
  "epss": 0.01803,
  "epssPercentile": 0.78681,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "runc",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.0.3\u002Bds1-1",
      "fix": "DEBIAN-CVE-2021-43784",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-43784",
      "released": "2021-12-06T18:15:08Z"
    },
    {
      "platform": "linux",
      "product": "runc",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.0.3\u002Bds1-1",
      "fix": "DEBIAN-CVE-2021-43784",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-43784",
      "released": "2021-12-06T18:15:08Z"
    },
    {
      "platform": "linux",
      "product": "runc",
      "release": "Debian 14",
      "fixedVersion": "1.0.3\u002Bds1-1",
      "fix": "DEBIAN-CVE-2021-43784",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-43784",
      "released": "2021-12-06T18:15:08Z"
    },
    {
      "platform": "linux",
      "product": "runc",
      "release": "RHEL 9",
      "fixedVersion": "4:1.1.9-1.el9",
      "fix": "RHSA-2023:6380",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2023-6380",
      "released": "2023-11-07T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "runc",
      "release": "almalinux 9",
      "fixedVersion": "4:1.1.9-1.el9",
      "fix": "ALSA-2023:6380",
      "url": "https://patchblox.com/security/fix/linux/alsa-2023-6380",
      "released": "2023-11-07T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "runc",
      "release": "ol 9",
      "fixedVersion": "4:1.1.9-1.el9",
      "fix": "ELSA-2023-6380",
      "url": "https://patchblox.com/security/fix/linux/elsa-2023-6380",
      "released": "2023-11-11T00:00:00Z"
    }
  ],
  "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"
  }
}