{
  "cveId": "CVE-2026-53612",
  "url": "https://patchblox.com/security/cve/CVE-2026-53612",
  "summary": "CVE-2026-53612 is fixed in 34 products on 1 platform, first by DEBIAN-CVE-2026-53612, released June 27, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "util-linux mount hook_owner TOCTOU allows local privilege escalation",
  "description": "util-linux is a random collection of Linux utilities. In util-linux 2.39 through 2.41.4 and 2.42 through 2.42.1, the SUID \u0060mount\u0060 utility\u0027s \u0060hook_owner.c\u0060 post-mount hook performs path-based \u0060chmod()\u0060 and \u0060lchown()\u0060 operations on a previously validated mount target. A local low-privileged user authorized by an \u0060/etc/fstab\u0060 entry with \u0060user\u0060 or \u0060users\u0060 and an \u0060X-mount.mode\u0060, \u0060X-mount.owner\u0060, or \u0060X-mount.group\u0060 option can use \u0060renameat2(RENAME_EXCHANGE)\u0060 to race a writable ancestor of the target and redirect the privileged ownership or mode change to a root-owned path, potentially gaining root privileges. This issue is fixed in 2.41.5 and 2.42.2.",
  "published": "2026-06-16T00:00:00Z",
  "severity": "Moderate",
  "cvss": 8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
  "cwe": "Time-of-check Time-of-use (TOCTOU) Race Condition",
  "epss": 0.00152,
  "epssPercentile": 0.04365,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53612",
  "fixes": [
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bsdextrautils-2.39.3-9ubuntu6.6",
      "released": "2026-06-29T02:16:00Z"
    },
    {
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      "product": "bsdextrautils",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "2.41.3-3ubuntu2.2",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-bsdextrautils-2.41.3-3ubuntu2.2",
      "released": "2026-06-29T02:16:00Z"
    },
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-bsdutils-1-2.39.3-9ubuntu6.6",
      "released": "2026-06-29T02:16:00Z"
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      "released": "2026-06-29T02:16:00Z"
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    {
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      "released": "2026-06-29T02:16:00Z"
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-eject-2.41.3-3ubuntu2.2",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-fdisk-2.39.3-9ubuntu6.6",
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