Vulnerability-Lookup

GHSA-CRP4-CFVG-6VR3

Vulnerability from github – Published: 2026-10-15 09:30 – Updated: 2026-10-15 09:30

Details

A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-101305"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-273"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-15T07:17:57Z",
    "severity": null
  },
  "details": "renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments.  A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2).  This requires the directory to reside on a filesystem that is also reachable from the jail\u0027s root.\n\nA process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail\u0027s filesystem root restriction.",
  "id": "GHSA-crp4-cfvg-6vr3",
  "modified": "2026-10-15T09:30:32Z",
  "published": "2026-10-15T09:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101305"
    },
    {
      "type": "WEB",
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-101305 (GCVE-0-2026-101305)

Vulnerability from cvelistv5 – Published: 2026-10-15 06:46 – Updated: 2026-10-15 06:46

Title

Multiple jail filesystem root escapes

Summary

renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root. A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.

Severity

No CVSS data available.

CWE

CWE-273 - Improper Check for Dropped Privileges

Assigner

freebsd CNA under the mitre root

CNA scorecard D 60/100 over 69 records in the last 180 days details

References

1 reference

URL	Tags
https://security.freebsd.org/advisories/FreeBSD-S…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
FreeBSD	FreeBSD	Affected: 15.1-RELEASE , < p4 (release) Affected: 15.0-RELEASE , < p14 (release) Affected: 14.5-RELEASE , < p1 (release) Affected: 14.4-RELEASE , < p10 (release)

Date Public

2026-09-29 20:30

Credits

Jan Bramkamp

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "jail"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p4",
              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p14",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p1",
              "status": "affected",
              "version": "14.5-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p10",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Jan Bramkamp"
        }
      ],
      "datePublic": "2026-09-29T20:30:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments.  A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2).  This requires the directory to reside on a filesystem that is also reachable from the jail\u0027s root.\n\nA process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail\u0027s filesystem root restriction."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-273",
              "description": "CWE-273: Improper Check for Dropped Privileges",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-15T06:46:16.471Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc"
        }
      ],
      "title": "Multiple jail filesystem root escapes",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-101305",
    "datePublished": "2026-10-15T06:46:16.471Z",
    "dateReserved": "2026-09-28T13:33:02.323Z",
    "dateUpdated": "2026-10-15T06:46:16.471Z",
    "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.

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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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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.

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