# CVE-2026-79619: zfs-linux: On Linux, several OpenZFS ioctl authorization checks accept a capability held only within a user-created, unprivilege...

CVE-2026-79619 is fixed in 22 products on 1 platform, first by libnvpair3linux 2.4.1-1ubuntu5.1, released August 26, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-79619
- Priority: High
- CVSS: n/a (High)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 26, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libnvpair1linux Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [libnvpair1linux 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnvpair1linux-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | libnvpair1linux Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [libnvpair1linux 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnvpair1linux-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | libnvpair3linux Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [libnvpair3linux 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libnvpair3linux-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | libnvpair3linux Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [libnvpair3linux 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libnvpair3linux-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | libnvpair3linux Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [libnvpair3linux 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libnvpair3linux-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | libpam-zfs Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [libpam-zfs 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libpam-zfs-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | libpam-zfs Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [libpam-zfs 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libpam-zfs-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | libpam-zfs Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [libpam-zfs 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libpam-zfs-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | libuutil1linux Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [libuutil1linux 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libuutil1linux-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | libuutil1linux Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [libuutil1linux 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libuutil1linux-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | libuutil3linux Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [libuutil3linux 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libuutil3linux-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | libuutil3linux Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [libuutil3linux 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libuutil3linux-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | libuutil3linux Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [libuutil3linux 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libuutil3linux-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | libzfs2linux Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [libzfs2linux 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libzfs2linux-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | libzfs2linux Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [libzfs2linux 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libzfs2linux-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | libzfs4linux Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [libzfs4linux 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libzfs4linux-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | libzfs4linux Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [libzfs4linux 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libzfs4linux-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | libzfs7linux Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [libzfs7linux 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libzfs7linux-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | libzfsbootenv1linux Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [libzfsbootenv1linux 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libzfsbootenv1linux-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | libzfsbootenv1linux Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [libzfsbootenv1linux 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libzfsbootenv1linux-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | libzfsbootenv1linux Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [libzfsbootenv1linux 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libzfsbootenv1linux-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | libzpool2linux Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [libzpool2linux 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libzpool2linux-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | libzpool2linux Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [libzpool2linux 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libzpool2linux-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | libzpool5linux Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [libzpool5linux 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libzpool5linux-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | libzpool5linux Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [libzpool5linux 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libzpool5linux-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | libzpool7linux Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [libzpool7linux 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libzpool7linux-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | python3-pyzfs Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [python3-pyzfs 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-pyzfs-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | python3-pyzfs Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [python3-pyzfs 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-pyzfs-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | python3-pyzfs Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [python3-pyzfs 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-pyzfs-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | python3-pyzfs Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [python3-pyzfs 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-pyzfs-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | spl Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [spl 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-spl-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | spl-dkms Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [spl-dkms 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-spl-dkms-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | zfs-dkms Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [zfs-dkms 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zfs-dkms-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | zfs-dkms Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [zfs-dkms 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zfs-dkms-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | zfs-dkms Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [zfs-dkms 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-zfs-dkms-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | zfs-dkms Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [zfs-dkms 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-zfs-dkms-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | zfs-dkms Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [zfs-dkms 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-zfs-dkms-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | zfs-dracut Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [zfs-dracut 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zfs-dracut-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | zfs-dracut Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [zfs-dracut 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zfs-dracut-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | zfs-dracut Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [zfs-dracut 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-zfs-dracut-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | zfs-dracut Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [zfs-dracut 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-zfs-dracut-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | zfs-dracut Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [zfs-dracut 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-zfs-dracut-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | zfs-initramfs Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [zfs-initramfs 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zfs-initramfs-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | zfs-initramfs Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [zfs-initramfs 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zfs-initramfs-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | zfs-initramfs Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [zfs-initramfs 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-zfs-initramfs-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | zfs-initramfs Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [zfs-initramfs 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-zfs-initramfs-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | zfs-initramfs Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [zfs-initramfs 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-zfs-initramfs-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | zfs-linux Debian 13.5 (trixie) | 2.3.9-0+deb13u1 | [DEBIAN-CVE-2026-79619](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79619.md) | Aug 27, 2026 |
| Linux | zfs-linux Debian 14 | 2.4.4-1 | [DEBIAN-CVE-2026-79619](https://patchblox.com/security/data/fix/linux/debian-cve-2026-79619.md) | Aug 27, 2026 |
| Linux | zfs-test Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [zfs-test 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zfs-test-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | zfs-test Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [zfs-test 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zfs-test-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | zfs-test Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [zfs-test 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-zfs-test-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | zfs-test Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [zfs-test 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-zfs-test-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | zfs-test Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [zfs-test 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-zfs-test-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | zfs-zed Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [zfs-zed 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zfs-zed-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | zfs-zed Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [zfs-zed 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zfs-zed-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | zfs-zed Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [zfs-zed 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-zfs-zed-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | zfs-zed Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [zfs-zed 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-zfs-zed-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | zfs-zed Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [zfs-zed 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-zfs-zed-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |
| Linux | zfsutils-linux Ubuntu 18.04.6 LTS (bionic) | 0.7.5-1ubuntu16.12+esm1 | [zfsutils-linux 0.7.5-1ubuntu16.12+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zfsutils-linux-0.7.5-1ubuntu16.12-esm1.md) | Sep 3, 2026 |
| Linux | zfsutils-linux Ubuntu 20.04 LTS (focal) | 0.8.3-1ubuntu12.18+esm1 | [zfsutils-linux 0.8.3-1ubuntu12.18+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-zfsutils-linux-0.8.3-1ubuntu12.18-esm1.md) | Sep 3, 2026 |
| Linux | zfsutils-linux Ubuntu 22.04.1 LTS (jammy) | 2.1.5-1ubuntu6~22.04.7 | [zfsutils-linux 2.1.5-1ubuntu6~22.04.7](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-zfsutils-linux-2.1.5-1ubuntu6-22.04.7.md) | Sep 3, 2026 |
| Linux | zfsutils-linux Ubuntu 24.04.5 LTS (noble) | 2.2.2-0ubuntu9.5 | [zfsutils-linux 2.2.2-0ubuntu9.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-zfsutils-linux-2.2.2-0ubuntu9.5.md) | Sep 3, 2026 |
| Linux | zfsutils-linux Ubuntu 26.04.1 LTS (resolute) | 2.4.1-1ubuntu5.1 | [zfsutils-linux 2.4.1-1ubuntu5.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-zfsutils-linux-2.4.1-1ubuntu5.1.md) | Aug 26, 2026 |

---

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