FKIE_CVE-2026-53612

Vulnerability from fkie_nvd - Published: 2026-10-14 15:17 - Updated: 2026-10-14 19:17
Severity
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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 `mount` utility's `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` 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.
References
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc
security-advisories@github.comhttps://github.com/util-linux/util-linux/releases/tag/v2.41.5
security-advisories@github.comhttps://github.com/util-linux/util-linux/releases/tag/v2.42.2
security-advisories@github.comhttps://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "util-linux",
          "vendor": "util-linux",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.39, \u003c 2.41.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.42, \u003c 2.42.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 `mount` utility\u0027s `hook_owner.c` post-mount hook performs path-based `chmod()` and `lchown()` operations on a previously validated mount target. A local low-privileged user authorized by an `/etc/fstab` entry with `user` or `users` and an `X-mount.mode`, `X-mount.owner`, or `X-mount.group` option can use `renameat2(RENAME_EXCHANGE)` 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."
    }
  ],
  "id": "CVE-2026-53612",
  "lastModified": "2026-10-14T19:17:17.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-53612",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-14T18:24:31.298549Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-14T15:17:20.260",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/releases/tag/v2.41.5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/releases/tag/v2.42.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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