{
  "cveId": "CVE-2021-3996",
  "url": "https://patchblox.com/security/cve/CVE-2021-3996",
  "summary": "CVE-2021-3996 is fixed in 39 products on 1 platform, first by bsdextrautils 2.37.2-4ubuntu2, released January 31, 2022. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "util-linux: A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unm...",
  "description": "A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users\u0027 filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.",
  "published": "2022-01-31T16:00:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00641,
  "epssPercentile": 0.50994,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bsdextrautils",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.37.2-4ubuntu2",
      "fix": "bsdextrautils 2.37.2-4ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bsdextrautils-2.37.2-4ubuntu2",
      "released": "2022-01-31T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bsdutils",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1:2.34-0.1ubuntu9.3",
      "fix": "bsdutils 1:2.34-0.1ubuntu9.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-bsdutils-1-2.34-0.1ubuntu9.3",
      "released": "2022-01-31T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bsdutils",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1:2.37.2-4ubuntu2",
      "fix": "bsdutils 1:2.37.2-4ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-bsdutils-1-2.37.2-4ubuntu2",
      "released": "2022-01-31T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "eject",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.37.2-4ubuntu2",
      "fix": "eject 2.37.2-4ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-eject-2.37.2-4ubuntu2",
      "released": "2022-01-31T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "fdisk",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.34-0.1ubuntu9.3",
      "fix": "fdisk 2.34-0.1ubuntu9.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-fdisk-2.34-0.1ubuntu9.3",
      "released": "2022-01-31T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "fdisk",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.37.2-4ubuntu2",
      "fix": "fdisk 2.37.2-4ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-fdisk-2.37.2-4ubuntu2",
      "released": "2022-01-31T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libblkid",
      "release": "amzn 2023",
      "fixedVersion": "2.37.4-1.amzn2023.0.3",
      "fix": "ALAS2023-2023-024",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-024",
      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "libblkid-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.37.4-1.amzn2023.0.3",
      "fix": "ALAS2023-2023-024",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-024",
      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "libblkid-devel",
      "release": "amzn 2023",
      "fixedVersion": "2.37.4-1.amzn2023.0.3",
      "fix": "ALAS2023-2023-024",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-024",
      "released": "2023-02-17T20:43:00Z"
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      "platform": "linux",
      "product": "libblkid1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.34-0.1ubuntu9.3",
      "fix": "libblkid1 2.34-0.1ubuntu9.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libblkid1-2.34-0.1ubuntu9.3",
      "released": "2022-01-31T16:00:00Z"
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    {
      "platform": "linux",
      "product": "libblkid1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "2.37.2-4ubuntu2",
      "fix": "libblkid1 2.37.2-4ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libblkid1-2.37.2-4ubuntu2",
      "released": "2022-01-31T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libfdisk",
      "release": "amzn 2023",
      "fixedVersion": "2.37.4-1.amzn2023.0.3",
      "fix": "ALAS2023-2023-024",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-024",
      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "libfdisk-debuginfo",
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      "released": "2023-02-17T20:43:00Z"
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      "released": "2023-02-17T20:43:00Z"
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      "platform": "linux",
      "product": "libfdisk1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.34-0.1ubuntu9.3",
      "fix": "libfdisk1 2.34-0.1ubuntu9.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libfdisk1-2.34-0.1ubuntu9.3",
      "released": "2022-01-31T16:00:00Z"
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      "platform": "linux",
      "product": "libfdisk1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "fix": "libfdisk1 2.37.2-4ubuntu2",
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      "released": "2022-01-31T16:00:00Z"
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    {
      "platform": "linux",
      "product": "libmount",
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      "product": "libmount-debuginfo",
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      "product": "libmount-devel",
      "release": "amzn 2023",
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      "released": "2023-02-17T20:43:00Z"
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      "platform": "linux",
      "product": "libmount1",
      "release": "Ubuntu 20.04 LTS (focal)",
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      "product": "libmount1",
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      "product": "libsmartcols",
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      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "rfkill",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.34-0.1ubuntu9.3",
      "fix": "rfkill 2.34-0.1ubuntu9.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-rfkill-2.34-0.1ubuntu9.3",
      "released": "2022-01-31T16:00:00Z"
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      "platform": "linux",
      "product": "rfkill",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-rfkill-2.37.2-4ubuntu2",
      "released": "2022-01-31T16:00:00Z"
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    {
      "platform": "linux",
      "product": "util-linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.37.3-1",
      "fix": "DEBIAN-CVE-2021-3996",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3996",
      "released": "2022-08-23T20:15:08Z"
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      "fixedVersion": "2.37.4-1.amzn2023.0.3",
      "fix": "ALAS2023-2023-024",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-024",
      "released": "2023-02-17T20:43:00Z"
    }
  ],
  "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"
  }
}