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
Affected Vendors & Products
References
History
Thu, 27 Aug 2026 18:00:00 +0000
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Wed, 26 Aug 2026 16:30:00 +0000
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ssvc
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Wed, 26 Aug 2026 15:30:00 +0000
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Openzfs
Openzfs openzfs |
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Openzfs
Openzfs openzfs |
Wed, 26 Aug 2026 13:00:00 +0000
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| 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 | |
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| Metrics |
cvssV4_0
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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
Updated: 2026-08-26T15:47:16.882Z
Status : Awaiting Analysis
Published: 2026-08-26T13:19:24.003
Modified: 2026-08-28T15:24:38.600
Link: CVE-2026-79619
No data.