ubuntu-cve-2026-79619
Vulnerability from osv_ubuntu
Published
2026-08-27 00:00
Modified
2026-09-01 06:14
Summary
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
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libnvpair1linux",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "libuutil1linux",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "libzfs2linux",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "libzpool2linux",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "zfs-dkms",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "zfs-dracut",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "zfs-initramfs",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "zfs-test",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "zfs-zed",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
},
{
"binary_name": "zfsutils-linux",
"binary_version": "0.7.5-1ubuntu16.12+esm1"
}
],
"priority_reason": "See ubuntu cvss score"
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "zfs-linux",
"purl": "pkg:deb/ubuntu/zfs-linux@0.7.5-1ubuntu16.12+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7.5-1ubuntu16.12+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.5.11-1ubuntu3",
"0.6.5.11-1ubuntu4",
"0.6.5.11-1ubuntu5",
"0.6.5.11-1ubuntu6",
"0.7.5-1ubuntu2",
"0.7.5-1ubuntu3",
"0.7.5-1ubuntu4",
"0.7.5-1ubuntu5",
"0.7.5-1ubuntu6",
"0.7.5-1ubuntu7",
"0.7.5-1ubuntu8",
"0.7.5-1ubuntu9",
"0.7.5-1ubuntu10",
"0.7.5-1ubuntu11",
"0.7.5-1ubuntu12",
"0.7.5-1ubuntu13",
"0.7.5-1ubuntu14",
"0.7.5-1ubuntu15",
"0.7.5-1ubuntu16",
"0.7.5-1ubuntu16.2",
"0.7.5-1ubuntu16.3",
"0.7.5-1ubuntu16.4",
"0.7.5-1ubuntu16.6",
"0.7.5-1ubuntu16.7",
"0.7.5-1ubuntu16.8",
"0.7.5-1ubuntu16.9",
"0.7.5-1ubuntu16.10",
"0.7.5-1ubuntu16.11",
"0.7.5-1ubuntu16.12"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libnvpair1linux",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "libuutil1linux",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "libzfs2linux",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "libzpool2linux",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "python3-pyzfs",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "spl",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "spl-dkms",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "zfs-dkms",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "zfs-dracut",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "zfs-initramfs",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "zfs-test",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "zfs-zed",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
},
{
"binary_name": "zfsutils-linux",
"binary_version": "0.8.3-1ubuntu12.18+esm1"
}
],
"priority_reason": "See ubuntu cvss score"
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "zfs-linux",
"purl": "pkg:deb/ubuntu/zfs-linux@0.8.3-1ubuntu12.18+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.3-1ubuntu12.18+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.8.1-1ubuntu14",
"0.8.1-1ubuntu15",
"0.8.1-1ubuntu16",
"0.8.1-1ubuntu17",
"0.8.2-3ubuntu1",
"0.8.2-3ubuntu2",
"0.8.2-3ubuntu3",
"0.8.2-3ubuntu4",
"0.8.2-3ubuntu5",
"0.8.3-1ubuntu2",
"0.8.3-1ubuntu3",
"0.8.3-1ubuntu4",
"0.8.3-1ubuntu5",
"0.8.3-1ubuntu6",
"0.8.3-1ubuntu7",
"0.8.3-1ubuntu8",
"0.8.3-1ubuntu9",
"0.8.3-1ubuntu10",
"0.8.3-1ubuntu11",
"0.8.3-1ubuntu12",
"0.8.3-1ubuntu12.1",
"0.8.3-1ubuntu12.2",
"0.8.3-1ubuntu12.3",
"0.8.3-1ubuntu12.4",
"0.8.3-1ubuntu12.5",
"0.8.3-1ubuntu12.6",
"0.8.3-1ubuntu12.7",
"0.8.3-1ubuntu12.8",
"0.8.3-1ubuntu12.9",
"0.8.3-1ubuntu12.10",
"0.8.3-1ubuntu12.11",
"0.8.3-1ubuntu12.12",
"0.8.3-1ubuntu12.13",
"0.8.3-1ubuntu12.14",
"0.8.3-1ubuntu12.15",
"0.8.3-1ubuntu12.16",
"0.8.3-1ubuntu12.17",
"0.8.3-1ubuntu12.18"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnvpair3linux",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "libpam-zfs",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "libuutil3linux",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "libzfs4linux",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "libzfsbootenv1linux",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "libzpool5linux",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "python3-pyzfs",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "zfs-dkms",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "zfs-dracut",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "zfs-initramfs",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "zfs-test",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "zfs-zed",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
},
{
"binary_name": "zfsutils-linux",
"binary_version": "2.1.5-1ubuntu6~22.04.7"
}
],
"priority_reason": "See ubuntu cvss score"
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "zfs-linux",
"purl": "pkg:deb/ubuntu/zfs-linux@2.1.5-1ubuntu6~22.04.7?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.5-1ubuntu6~22.04.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.6-1ubuntu2",
"2.0.6-1ubuntu3",
"2.1.2-1ubuntu1",
"2.1.2-1ubuntu2",
"2.1.2-1ubuntu3",
"2.1.4-0ubuntu0.1",
"2.1.5-1ubuntu6~22.04.1",
"2.1.5-1ubuntu6~22.04.2",
"2.1.5-1ubuntu6~22.04.3",
"2.1.5-1ubuntu6~22.04.4",
"2.1.5-1ubuntu6~22.04.5",
"2.1.5-1ubuntu6~22.04.6"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnvpair3linux",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "libpam-zfs",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "libuutil3linux",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "libzfs4linux",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "libzfsbootenv1linux",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "libzpool5linux",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "python3-pyzfs",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "zfs-dkms",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "zfs-dracut",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "zfs-initramfs",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "zfs-test",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "zfs-zed",
"binary_version": "2.2.2-0ubuntu9.5"
},
{
"binary_name": "zfsutils-linux",
"binary_version": "2.2.2-0ubuntu9.5"
}
],
"priority_reason": "See ubuntu cvss score"
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "zfs-linux",
"purl": "pkg:deb/ubuntu/zfs-linux@2.2.2-0ubuntu9.5?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.2.2-0ubuntu9.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.0~rc3-0ubuntu4",
"2.2.0-0ubuntu1",
"2.2.0-0ubuntu3",
"2.2.1-0ubuntu1",
"2.2.2-0ubuntu1",
"2.2.2-0ubuntu2",
"2.2.2-0ubuntu3",
"2.2.2-0ubuntu4",
"2.2.2-0ubuntu7",
"2.2.2-0ubuntu8",
"2.2.2-0ubuntu9",
"2.2.2-0ubuntu9.1",
"2.2.2-0ubuntu9.2",
"2.2.2-0ubuntu9.3",
"2.2.2-0ubuntu9.4"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnvpair3linux",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "libpam-zfs",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "libuutil3linux",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "libzfs7linux",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "libzfsbootenv1linux",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "libzpool7linux",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "python3-pyzfs",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "zfs-dkms",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "zfs-dracut",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "zfs-initramfs",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "zfs-test",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "zfs-zed",
"binary_version": "2.4.1-1ubuntu5.1"
},
{
"binary_name": "zfsutils-linux",
"binary_version": "2.4.1-1ubuntu5.1"
}
],
"priority_reason": "See ubuntu cvss score"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "zfs-linux",
"purl": "pkg:deb/ubuntu/zfs-linux@2.4.1-1ubuntu5.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.1-1ubuntu5.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.3.4-1ubuntu2",
"2.3.5-1ubuntu1",
"2.3.5-1ubuntu2",
"2.4.0-1ubuntu2",
"2.4.0-1ubuntu3",
"2.4.0-1ubuntu4",
"2.4.1-1ubuntu1",
"2.4.1-1ubuntu2",
"2.4.1-1ubuntu3",
"2.4.1-1ubuntu4",
"2.4.1-1ubuntu5"
]
}
],
"aliases": [],
"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": "UBUNTU-CVE-2026-79619",
"modified": "2026-09-01T06:14:17Z",
"published": "2026-08-27T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-79619"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-79619"
},
{
"type": "REPORT",
"url": "https://github.com/advisories/GHSA-mhf5-q8gw-qg9v"
},
{
"type": "REPORT",
"url": "https://www.openwall.com/lists/oss-security/2026/08/16/5"
},
{
"type": "REPORT",
"url": "https://github.com/openzfs/zfs/pull/18959"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8705-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8705-2"
}
],
"related": [
"USN-8705-1",
"USN-8705-2"
],
"schema_version": "1.7.0",
"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",
"type": "CVSS_V4"
},
{
"score": "high",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-79619"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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