{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-79619", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "state": "PUBLISHED", "assignerShortName": "canonical", "dateReserved": "2026-08-25T08:10:52.983Z", "datePublished": "2026-08-26T12:50:10.502Z", "dateUpdated": "2026-08-26T12:50:10.502Z"}, "containers": {"cna": {"title": "OpenZFS: user-namespace capability check allows unprivileged local authorization bypass", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-863", "description": "CWE-863 Incorrect Authorization", "type": "CWE"}]}], "affected": [{"vendor": "OpenZFS", "product": "OpenZFS", "platforms": ["Linux"], "repo": "https://github.com/openzfs/zfs", "versions": [{"status": "affected", "version": "0", "lessThan": "2.2.11", "versionType": "semver"}, {"status": "affected", "version": "2.3.0", "lessThan": "2.3.9", "versionType": "semver"}, {"status": "affected", "version": "2.4.0", "lessThan": "2.4.4", "versionType": "semver"}], "defaultStatus": "unaffected"}], "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."}], "references": [{"url": "https://github.com/openzfs/zfs/pull/18959", "tags": ["patch"]}, {"url": "https://github.com/advisories/GHSA-mhf5-q8gw-qg9v", "tags": ["vendor-advisory"]}, {"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": ["product"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.3, "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"}}], "credits": [{"lang": "en", "value": "Erica Windisch", "type": "reporter"}, {"lang": "en", "value": "Rob Norris", "type": "remediation developer"}], "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-08-26T12:50:10.502Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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