Vulnerability-Lookup

CVE-2026-35352 (GCVE-0-2026-35352)

Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-05-04 17:32

Title

uutils coreutils mkfifo Privilege Escalation via TOCTOU Race Condition

Summary

A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mkfifo utility of uutils coreutils. The utility creates a FIFO and then performs a path-based chmod to set permissions. A local attacker with write access to the parent directory can swap the newly created FIFO for a symbolic link between these two operations. This redirects the chmod call to an arbitrary file, potentially enabling privilege escalation if the utility is run with elevated privileges.

Severity

7 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-24 13:42 UTC

CWE

CWE-367 - Time-of-Check Time-of-Use (TOCTOU) Race Condition

Assigner

canonical CNA under the mitre root

CNA scorecard B 82/100 over 58 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/uutils/coreutils/issues/10020	issue-tracking
http://www.openwall.com/lists/oss-security/2026/05/04/4
http://www.openwall.com/lists/oss-security/2026/05/04/5
http://www.openwall.com/lists/oss-security/2026/05/04/6

Impacted products

1 product

Vendor	Product	Version	CPE status
Uutils	coreutils		guessed

Credits

Zellic

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-35352

Vulnerability from fkie_nvd - Published: 2026-04-22 17:16 - Updated: 2026-10-26 21:10

Severity

7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
security@ubuntu.com	https://github.com/uutils/coreutils/issues/10020	Exploit, Issue Tracking, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/04/4
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/04/5
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/04/6
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/uutils/coreutils/issues/10020	Exploit, Issue Tracking, Vendor Advisory

Impacted products

	Vendor	Product	Version
	uutils	coreutils	-

JSON

To clipboard

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      ],
      "source": "security@ubuntu.com",
      "type": "Secondary"
    }
  ]
}

GHSA-9GH9-HWPR-RVQQ

Vulnerability from github – Published: 2026-04-22 18:31 – Updated: 2026-05-08 01:24

Summary

uutils coreutils has a Time-of-Check to Time-of-Use (TOCTOU) race condition

Details

Severity

7.0 (High)


                  
                    CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "coreutils"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35352"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-30T17:09:11Z",
    "nvd_published_at": "2026-04-22T17:16:37Z",
    "severity": "HIGH"
  },
  "details": "A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mkfifo utility of uutils coreutils. The utility creates a FIFO and then performs a path-based chmod to set permissions. A local attacker with write access to the parent directory can swap the newly created FIFO for a symbolic link between these two operations. This redirects the chmod call to an arbitrary file, potentially enabling privilege escalation if the utility is run with elevated privileges.",
  "id": "GHSA-9gh9-hwpr-rvqq",
  "modified": "2026-05-08T01:24:58Z",
  "published": "2026-04-22T18:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35352"
    },
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/issues/10020"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/uutils/coreutils"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/04/4"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/04/5"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/04/6"
    }
  ],
  "schema_version": "1.4.0",
  "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": "uutils coreutils has a Time-of-Check to Time-of-Use (TOCTOU) race condition"
}

UBUNTU-CVE-2026-35352 (CVE-2026-35352)

Vulnerability from osv_ubuntu – Published: 2026-04-22 17:16 – Updated: 2026-10-17 09:40 – Source website

Details

Severity

7.0 (High)


                    
                      CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-35352	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-35352	REPORT
	https://github.com/uutils/coreutils/issues/10020	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "rust-coreutils",
            "binary_version": "0.0.24-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rust-coreutils",
        "purl": "pkg:deb/ubuntu/rust-coreutils@0.0.24-2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.20-1",
        "0.0.22-1",
        "0.0.23-1",
        "0.0.23-2",
        "0.0.23-3",
        "0.0.24-1",
        "0.0.24-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "rust-coreutils",
            "binary_version": "0.2.2-0ubuntu2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-coreutils",
        "purl": "pkg:deb/ubuntu/rust-coreutils@0.2.2-0ubuntu2.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.30-1",
        "0.0.30-2",
        "0.0.30-2ubuntu2",
        "0.1.0-0ubuntu1",
        "0.1.0+git20250711.2ba3a33-0ubuntu1",
        "0.1.0+git20250711.2ba3a33-0ubuntu2",
        "0.1.0+git20250711.2ba3a33-0ubuntu3",
        "0.1.0+git20250711.2ba3a33-0ubuntu4",
        "0.1.0+git20250801.cf79675-0ubuntu1",
        "0.1.0+git20250813.4af2a84-0ubuntu2",
        "0.1.0+git20250813.4af2a84-0ubuntu4",
        "0.1.0+git20250813.4af2a84-0ubuntu6",
        "0.1.0+git20250813.4af2a84-0ubuntu7",
        "0.2.2-0ubuntu1",
        "0.2.2-0ubuntu2",
        "0.2.2-0ubuntu2.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "rust-coreutils",
            "binary_version": "0.12.0-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "rust-coreutils",
        "purl": "pkg:deb/ubuntu/rust-coreutils@0.12.0-1ubuntu2?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.8.0-0ubuntu3",
        "0.8.0-0ubuntu4",
        "0.9.0-2ubuntu2",
        "0.10.0-1ubuntu1",
        "0.10.0-1ubuntu2",
        "0.10.0-1ubuntu3",
        "0.11.0-2ubuntu1",
        "0.11.0-2ubuntu2",
        "0.12.0-1ubuntu1",
        "0.12.0-1ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "rust-coreutils",
            "binary_version": "0.10.0-1ubuntu2~26.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rust-coreutils",
        "purl": "pkg:deb/ubuntu/rust-coreutils@0.10.0-1ubuntu2~26.04.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2.2-0ubuntu2",
        "0.2.2-0ubuntu4",
        "0.5.0-0ubuntu1",
        "0.5.0-0ubuntu2",
        "0.6.0-0ubuntu1",
        "0.7.0-0ubuntu1",
        "0.8.0-0ubuntu3",
        "0.10.0-1ubuntu2~26.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A Time-of-Check to Time-of-Use (TOCTOU) race condition exists in the mkfifo utility of uutils coreutils. The utility creates a FIFO and then performs a path-based chmod to set permissions. A local attacker with write access to the parent directory can swap the newly created FIFO for a symbolic link between these two operations. This redirects the chmod call to an arbitrary file, potentially enabling privilege escalation if the utility is run with elevated privileges.",
  "id": "UBUNTU-CVE-2026-35352",
  "modified": "2026-10-17T09:40:53Z",
  "published": "2026-04-22T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-35352"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-35352"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/uutils/coreutils/issues/10020"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-35352"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-35352 (GCVE-0-2026-35352)

FKIE_CVE-2026-35352

GHSA-9GH9-HWPR-RVQQ

UBUNTU-CVE-2026-35352 (CVE-2026-35352)

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