{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.39"
              },
              {
                "fixed": "2.41.5"
              },
              {
                "introduced": "2.42"
              },
              {
                "fixed": "2.42.2"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "2dccaae42bfdd0f1e34da11f2023480655308e1b"
            },
            {
              "fixed": "230de59ffbee328506d92d3534e66d56de1afe5d"
            },
            {
              "introduced": "0a7dfc376192e8fb1e7bdb2d0c90d8b9b173a42b"
            },
            {
              "fixed": "f44509230b9f8224993b8c6157f85888359a64e1"
            }
          ],
          "repo": "https://github.com/util-linux/util-linux",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g8wm-75wr-g2vh"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-367"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53612.json"
  },
  "details": "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.",
  "id": "CVE-2026-53612",
  "modified": "2026-10-15T10:30:47.727385566Z",
  "published": "2026-10-14T14:47:25.523Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53612.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/util-linux/util-linux/commit/24da33905c7115c4cbccd0afb2a469804e96467a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/util-linux/util-linux/commit/722c96974dd4009a334e4aee556eedaab5fb94b4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/util-linux/util-linux/commit/897a08c2b11dfa66975c3d24d63c7bf5f5be1a7c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/util-linux/util-linux/commit/d0c5adaeb3a3d823aba1377794de8f009b8152cc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/util-linux/util-linux/releases/tag/v2.41.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/util-linux/util-linux/releases/tag/v2.42.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/util-linux/util-linux/security/advisories/GHSA-g8wm-75wr-g2vh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53612"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "util-linux mount hook_owner TOCTOU allows local privilege escalation"
}