Vulnerability-Lookup

GHSA-5V2P-VXXV-R62R

Vulnerability from github – Published: 2026-08-26 18:31 – Updated: 2026-08-27 21:31

Details

On Linux, several OpenZFS ioctl authorization checks accept a capability held only within a user-created, unprivileged namespace as equivalent to real host privilege, allowing an unprivileged local user to perform operations that should require root. Affected operations include pool-administrative operations (eg create, import, destroy), pool event log access (zpool events) and fault injection (zinject). Exploiting the problem requires only that the local user is permitted to open /dev/zfs (governed by local device permissions) and that the kernel permits unprivileged user namespace creation. No prior access to the target pool or its underlying devices is needed.

Severity

7.3 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2026-79619"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-26T13:19:24Z",
    "severity": "HIGH"
  },
  "details": "On Linux, several OpenZFS ioctl authorization checks accept a capability held only within a user-created, unprivileged namespace as equivalent to real host privilege, allowing an unprivileged local user to perform operations that should require root. Affected operations include pool-administrative operations (eg create, import, destroy), pool event log access (zpool events) and fault injection (zinject). Exploiting the problem requires only that the local user is permitted to open /dev/zfs (governed by local device permissions) and that the kernel permits unprivileged user namespace creation. No prior access to the target pool or its underlying devices is needed.",
  "id": "GHSA-5v2p-vxxv-r62r",
  "modified": "2026-08-27T21:31:24Z",
  "published": "2026-08-26T18:31:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79619"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openzfs/zfs/pull/18959"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-mhf5-q8gw-qg9v"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openzfs/zfs/releases/tag/zfs-2.2.11"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openzfs/zfs/releases/tag/zfs-2.3.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openzfs/zfs/releases/tag/zfs-2.4.4"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/fulldisclosure/2026/Aug/40"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-79619 (GCVE-0-2026-79619)

Vulnerability from cvelistv5 – Published: 2026-08-26 12:50 – Updated: 2026-08-27 17:32

Title

OpenZFS: user-namespace capability check allows unprivileged local authorization bypass

Summary

Severity

7.3 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 15:47 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

canonical mitre root

References

6 references

URL	Tags
https://github.com/openzfs/zfs/pull/18959	patch
https://github.com/advisories/GHSA-mhf5-q8gw-qg9v	vendor-advisory
https://github.com/openzfs/zfs/releases/tag/zfs-2.4.4	product
https://github.com/openzfs/zfs/releases/tag/zfs-2.3.9	product
https://github.com/openzfs/zfs/releases/tag/zfs-2.2.11	product
https://seclists.org/fulldisclosure/2026/Aug/40	mailing-list

Impacted products

1 product

Vendor	Product	Version
OpenZFS	OpenZFS	Affected: 0.7.0 , < 2.2.11 (semver) Affected: 2.3.0 , < 2.3.9 (semver) Affected: 2.4.0 , < 2.4.4 (semver)

Credits

Erica Windisch Rob Norris

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-79619",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-26T15:47:13.454769Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-26T15:47:19.764Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "Linux"
          ],
          "product": "OpenZFS",
          "repo": "https://github.com/openzfs/zfs",
          "vendor": "OpenZFS",
          "versions": [
            {
              "lessThan": "2.2.11",
              "status": "affected",
              "version": "0.7.0",
              "versionType": "semver"
            },
            {
              "lessThan": "2.3.9",
              "status": "affected",
              "version": "2.3.0",
              "versionType": "semver"
            },
            {
              "lessThan": "2.4.4",
              "status": "affected",
              "version": "2.4.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Erica Windisch"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Rob Norris"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "On Linux, several OpenZFS ioctl authorization checks accept a capability held only within a user-created, unprivileged namespace as equivalent to real host privilege, allowing an unprivileged local user to perform operations that should require root. Affected operations include pool-administrative operations (eg create, import, destroy), pool event log access (zpool events) and fault injection (zinject). Exploiting the problem requires only that the local user is permitted to open /dev/zfs (governed by local device permissions) and that the kernel permits unprivileged user namespace creation. No prior access to the target pool or its underlying devices is needed."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863 Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T17:32:03.057Z",
        "orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
        "shortName": "canonical"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openzfs/zfs/pull/18959"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/advisories/GHSA-mhf5-q8gw-qg9v"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/openzfs/zfs/releases/tag/zfs-2.4.4"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/openzfs/zfs/releases/tag/zfs-2.3.9"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/openzfs/zfs/releases/tag/zfs-2.2.11"
        },
        {
          "tags": [
            "mailing-list"
          ],
          "url": "https://seclists.org/fulldisclosure/2026/Aug/40"
        }
      ],
      "title": "OpenZFS: user-namespace capability check allows unprivileged local authorization bypass",
      "x_generator": {
        "engine": "cvelib 1.8.0"
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  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2026-79619",
    "datePublished": "2026-08-26T12:50:10.502Z",
    "dateReserved": "2026-08-25T08:10:52.983Z",
    "dateUpdated": "2026-08-27T17:32:03.057Z",
    "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.

Action not permitted

GHSA-5V2P-VXXV-R62R

CVE-2026-79619 (GCVE-0-2026-79619)

Tags

Sightings

Nomenclature