Vulnerability-Lookup

GHSA-R9HW-MJ3W-PHCQ

Vulnerability from github – Published: 2026-07-06 21:54 – Updated: 2026-07-06 21:54

Summary

mknod: Device nodes created mislabeled on SELinux, with broken cleanup (remove_dir on a node)

Details

uutils calls mknod before setting the SELinux context (GNU uses setfscreatecon first, labeling atomically). If set_selinux_security_context fails, cleanup uses std::fs::remove_dir, which cannot remove device nodes or FIFOs, leaving the mislabeled node behind.

Impact: on SELinux-enforcing systems the node is created with the wrong context; the command reports failure but leaves a mislabeled device node that may bypass mandatory access control, and orphaned nodes can persist across reboots. Recommendation: use setfscreatecon before mknod, abort on failure, and use remove_file for cleanup.

Remediation: Acknowledged by Canonical.

Reported by Zellic in the uutils coreutils Program Security Assessment (prepared for Canonical, Jan 20 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242. Finding 3.58. Credit: Zellic.

Severity

3.4 (Low)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "uu_mknod"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.6.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35361"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-281",
      "CWE-459",
      "CWE-732"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-06T21:54:05Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "uutils calls `mknod` *before* setting the SELinux context (GNU uses `setfscreatecon` first, labeling atomically). If `set_selinux_security_context` fails, cleanup uses `std::fs::remove_dir`, which cannot remove device nodes or FIFOs, leaving the mislabeled node behind.\n\n**Impact:** on SELinux-enforcing systems the node is created with the wrong context; the command reports failure but leaves a mislabeled device node that may bypass mandatory access control, and orphaned nodes can persist across reboots. Recommendation: use `setfscreatecon` before `mknod`, abort on failure, and use `remove_file` for cleanup.\n\n**Remediation:** Acknowledged by Canonical.\n\n---\n_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.58. Credit: Zellic._",
  "id": "GHSA-r9hw-mj3w-phcq",
  "modified": "2026-07-06T21:54:05Z",
  "published": "2026-07-06T21:54:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/security/advisories/GHSA-r9hw-mj3w-phcq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35361"
    },
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/pull/10582"
    },
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/commit/42b2ad83cdcf6e959ecb378c5040c60d9c64becf"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/uutils/coreutils"
    },
    {
      "type": "WEB",
      "url": "https://github.com/uutils/coreutils/releases/tag/0.6.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mknod: Device nodes created mislabeled on SELinux, with broken cleanup (remove_dir on a node)"
}

CVE-2026-35361 (GCVE-0-2026-35361)

Vulnerability from cvelistv5 – Published: 2026-04-22 16:08 – Updated: 2026-04-22 17:35

Title

uutils coreutils mknod Security Label Inconsistency and Broken Cleanup on SELinux Systems

Summary

The mknod utility in uutils coreutils fails to handle security labels atomically by creating device nodes before setting the SELinux context. If labeling fails, the utility attempts cleanup using std::fs::remove_dir, which cannot remove device nodes or FIFOs. This leaves mislabeled nodes behind with incorrect default contexts, potentially allowing unauthorized access to device nodes that should have been restricted by mandatory access controls.

Severity

3.4 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 17:35 UTC

CWE

CWE-281 - Improper Preservation of Permissions
CWE-459 - Incomplete Cleanup

Assigner

canonical mitre root

References

2 references

URL	Tags
https://github.com/uutils/coreutils/pull/10582	issue-trackingpatch
https://github.com/uutils/coreutils/releases/tag/0.6.0	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Uutils	coreutils	Affected: 0 , < 0.6.0 (semver)

Credits

Zellic

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-35361",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T17:35:03.136773Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-22T17:35:15.707Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/uutils/coreutils/pull/10582"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/uutils",
          "defaultStatus": "unaffected",
          "packageName": "coreutils",
          "platforms": [
            "Linux",
            "Unix",
            "macOS"
          ],
          "product": "coreutils",
          "repo": "https://github.com/uutils/coreutils",
          "vendor": "Uutils",
          "versions": [
            {
              "lessThan": "0.6.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Zellic"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The mknod utility in uutils coreutils fails to handle security labels atomically by creating device nodes before setting the SELinux context. If labeling fails, the utility attempts cleanup using std::fs::remove_dir, which cannot remove device nodes or FIFOs. This leaves mislabeled nodes behind with incorrect default contexts, potentially allowing unauthorized access to device nodes that should have been restricted by mandatory access controls."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-180",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-180: Exploiting Incorrectly Configured Access Control Security Levels"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 3.4,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-281",
              "description": "CWE-281: Improper Preservation of Permissions",
              "lang": "en",
              "type": "CWE"
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            {
              "cweId": "CWE-459",
              "description": "CWE-459: Incomplete Cleanup",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-04-22T16:08:30.756Z",
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      "references": [
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          "tags": [
            "issue-tracking",
            "patch"
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          "url": "https://github.com/uutils/coreutils/pull/10582"
        },
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          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/uutils/coreutils/releases/tag/0.6.0"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "uutils coreutils mknod Security Label Inconsistency and Broken Cleanup on SELinux Systems"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2026-35361",
    "datePublished": "2026-04-22T16:08:30.756Z",
    "dateReserved": "2026-04-02T12:58:56.088Z",
    "dateUpdated": "2026-04-22T17:35:15.707Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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