{
  "cveId": "CVE-2021-3739",
  "url": "https://patchblox.com/security/cve/CVE-2021-3739",
  "summary": "CVE-2021-3739 is fixed in 12 products on 1 platform, first by ELSA-2021-9457, released September 22, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel,...",
  "description": "A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires \u2018CAP_SYS_ADMIN\u2019. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.",
  "published": "2021-09-22T00:00:00Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00621,
  "epssPercentile": 0.50018,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "kernel-uek",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el8uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-container",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el8",
      "fix": "ELSA-2021-9461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9461",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-container-debug",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el8",
      "fix": "ELSA-2021-9461",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9461",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-debug",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el8uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-debug-devel",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el8uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-devel",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el8uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-doc",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el8uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-tools",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el7uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-uek-tools-libs",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el7uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-3739",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3739",
      "released": "2022-03-10T17:43:01Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-3739",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3739",
      "released": "2022-03-10T17:43:01Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.14.6-1",
      "fix": "DEBIAN-CVE-2021-3739",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3739",
      "released": "2022-03-10T17:43:01Z"
    },
    {
      "platform": "linux",
      "product": "perf",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el7uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python-perf",
      "release": "ol 8",
      "fixedVersion": "0:5.4.17-2102.205.7.3.el7uek",
      "fix": "ELSA-2021-9457",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-9457",
      "released": "2021-09-22T00:00:00Z"
    }
  ],
  "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"
  }
}