FKIE_CVE-2026-53613

Vulnerability from fkie_nvd - Published: 2026-10-14 15:17 - Updated: 2026-10-15 16:18
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 2.17 through 2.41.6 and 2.42 through 2.42.3, and in 2.42.4 when the legacy `mount(2)` path is used without `/proc`, restricted non-root `mount` requests validate an `/etc/fstab` target before the mount operation re-resolves that pathname. A local low-privileged user authorized by an fstab `user` or `users` entry whose target has an attacker-writable ancestor can use `renameat2(RENAME_EXCHANGE)` to swap a path component and redirect an authorized mount to a root-owned location, such as mounting attacker-controlled content over `/etc/sudoers.d`, and thereby gain root privileges. Versions 2.41.5 and 2.42.2 pin targets for the new mount API, and 2.42.4 pins legacy targets through `/proc/self/fd`; the documented legacy fallback without `/proc` remains affected.
References
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/2c773f336134acf016e639abb6f12ba7341fe4b8
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/39fef62bf3226abb6bb018fa8750afa0327e84b4
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/472cc3fb2d4d47cca7aab2e0b59eb3fb8a9359ec
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/646fb66603d10a7ac337e14f566f1af48e3107c9
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/708d1b3c51932dc5ba8082c7368187715e6a8d78
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9
security-advisories@github.comhttps://github.com/util-linux/util-linux/commit/a9508d216eb8977979102782672e0470cc9bf2a2
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/releases/tag/v2.42.4
security-advisories@github.comhttps://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "util-linux",
          "vendor": "util-linux",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.17, \u003c= 2.41.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.42, \u003c= 2.42.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "util-linux is a random collection of Linux utilities. In util-linux 2.17 through 2.41.6 and 2.42 through 2.42.3, and in 2.42.4 when the legacy `mount(2)` path is used without `/proc`, restricted non-root `mount` requests validate an `/etc/fstab` target before the mount operation re-resolves that pathname. A local low-privileged user authorized by an fstab `user` or `users` entry whose target has an attacker-writable ancestor can use `renameat2(RENAME_EXCHANGE)` to swap a path component and redirect an authorized mount to a root-owned location, such as mounting attacker-controlled content over `/etc/sudoers.d`, and thereby gain root privileges. Versions 2.41.5 and 2.42.2 pin targets for the new mount API, and 2.42.4 pins legacy targets through `/proc/self/fd`; the documented legacy fallback without `/proc` remains affected."
    }
  ],
  "id": "CVE-2026-53613",
  "lastModified": "2026-10-15T16:18:12.987",
  "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-2026-53613",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T13:11:45.430649Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-14T15:17:20.410",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/0b010025a0e429bc80355c94db86a843395d49e2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/0d3d55975aa3492c62fd345eac38f41cd166c0b0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/2c773f336134acf016e639abb6f12ba7341fe4b8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/39fef62bf3226abb6bb018fa8750afa0327e84b4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/472cc3fb2d4d47cca7aab2e0b59eb3fb8a9359ec"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/646fb66603d10a7ac337e14f566f1af48e3107c9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/708d1b3c51932dc5ba8082c7368187715e6a8d78"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/commit/a9508d216eb8977979102782672e0470cc9bf2a2"
    },
    {
      "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/releases/tag/v2.42.4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-8gj5-72r3-428g"
    }
  ],
  "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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