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.
History

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
References

Wed, 26 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 26 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Openzfs
Openzfs openzfs
Vendors & Products Openzfs
Openzfs openzfs

Wed, 26 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
Description 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.
Title OpenZFS: user-namespace capability check allows unprivileged local authorization bypass
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 7.3, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: canonical

Published: 2026-08-26T12:50:10.502Z

Updated: 2026-08-27T17:32:03.057Z

Reserved: 2026-08-25T08:10:52.983Z

Link: CVE-2026-79619

cve-icon Vulnrichment

Updated: 2026-08-26T15:47:16.882Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-26T13:19:24.003

Modified: 2026-08-28T15:24:38.600

Link: CVE-2026-79619

cve-icon Redhat

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