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[USN-8705-1] OpenZFS vulnerability

Posted on 31 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8705-1
August 31, 2026

zfs-linux vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

OpenZFS could be made to run programs as an administrator.

Software Description:
- zfs-linux: OpenZFS file system for Linux

Details:

It was discovered that OpenZFS incorrectly handled authorization checks for
certain ioctl operations on Linux. A local attacker could possibly use this
issue to perform pool-administrative operations or access privileged
information, resulting in an authorization bypass.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libzfs7linux 2.4.1-1ubuntu5.1
zfs-dkms 2.4.1-1ubuntu5.1
zfsutils-linux 2.4.1-1ubuntu5.1

Ubuntu 24.04 LTS
libzfs4linux 2.2.2-0ubuntu9.5
zfs-dkms 2.2.2-0ubuntu9.5
zfsutils-linux 2.2.2-0ubuntu9.5

Ubuntu 22.04 LTS
libzfs4linux 2.1.5-1ubuntu6~22.04.7
zfs-dkms 2.1.5-1ubuntu6~22.04.7
zfsutils-linux 2.1.5-1ubuntu6~22.04.7

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8705-1
CVE-2026-79619

Package Information:
https://launchpad.net/ubuntu/+source/zfs-linux/2.4.1-1ubuntu5.1
https://launchpad.net/ubuntu/+source/zfs-linux/2.2.2-0ubuntu9.5
https://launchpad.net/ubuntu/+source/zfs-linux/2.1.5-1ubuntu6~22.04.7

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