Vulnerability-Lookup

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

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

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	CPE status
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)	guessed

Credits

Erica Windisch Rob Norris

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-79619

Vulnerability from fkie_nvd - Published: 2026-08-26 13:19 - Updated: 2026-08-27 20:18

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

Summary

References

	URL	Tags
	security@ubuntu.com	https://github.com/advisories/GHSA-mhf5-q8gw-qg9v
	security@ubuntu.com	https://github.com/openzfs/zfs/pull/18959
	security@ubuntu.com	https://github.com/openzfs/zfs/releases/tag/zfs-2.2.11
	security@ubuntu.com	https://github.com/openzfs/zfs/releases/tag/zfs-2.3.9
	security@ubuntu.com	https://github.com/openzfs/zfs/releases/tag/zfs-2.4.4
	security@ubuntu.com	https://seclists.org/fulldisclosure/2026/Aug/40

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-5V2P-VXXV-R62R

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

Details

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

Show details on source website

JSON

To clipboard

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    ],
    "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"
    }
  ]
}

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

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

FKIE_CVE-2026-79619

GHSA-5V2P-VXXV-R62R

Tags

Sightings

Nomenclature