CVE-2026-53613 (GCVE-0-2026-53613)

Vulnerability from cvelistv5 – Published: 2026-10-14 14:52 – Updated: 2026-10-15 15:08
VLAI
Title
util-linux mount target TOCTOU allows local privilege escalation
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.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 13:11 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7712 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
util-linux util-linux Affected: >= 2.17, <= 2.41.6
Affected: >= 2.42, <= 2.42.4
guessed Create a notification for this product.
Show details on NVD website

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              "name": "https://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/util-linux/util-linux/commit/78a860982e036f38fe9c0b3344998df5ac2c2ff5"
            },
            {
              "name": "https://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/util-linux/util-linux/commit/85d16b341f7232c9dbb4884b632e1e956584bee9"
            },
            {
              "name": "https://github.com/util-linux/util-linux/commit/a9508d216eb8977979102782672e0470cc9bf2a2",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/util-linux/util-linux/commit/a9508d216eb8977979102782672e0470cc9bf2a2"
            },
            {
              "name": "https://github.com/util-linux/util-linux/releases/tag/v2.41.5",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/util-linux/util-linux/releases/tag/v2.41.5"
            },
            {
              "name": "https://github.com/util-linux/util-linux/releases/tag/v2.42.2",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/util-linux/util-linux/releases/tag/v2.42.2"
            },
            {
              "name": "https://github.com/util-linux/util-linux/releases/tag/v2.42.4",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/util-linux/util-linux/releases/tag/v2.42.4"
            }
          ],
          "source": {
            "advisory": "GHSA-8gj5-72r3-428g",
            "discovery": "UNKNOWN"
          },
          "title": "util-linux mount target TOCTOU allows local privilege escalation"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-53613",
        "datePublished": "2026-10-14T14:52:56.063Z",
        "dateReserved": "2026-06-09T19:39:52.405Z",
        "dateUpdated": "2026-10-14T14:52:56.063Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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