An OpenZFS security update has been released for Ubuntu Linux 20.04 LTS, 22.04, and 23.04.

[USN-6511-1] OpenZFS vulnerability

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Ubuntu Security Notice USN-6511-1
November 23, 2023

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

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

OpenZFS could allow unintended access to network services.

Software Description:
- zfs-linux: OpenZFS filesystem for Linux

Details:

It was discovered that the OpenZFS sharenfs feature incorrectly handled
IPv6 address data. This could result in IPv6 restrictions not being
applied, contrary to expectations.

Update instructions:

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

Ubuntu 23.04:
libuutil3linux 2.1.9-2ubuntu1.2
zfsutils-linux 2.1.9-2ubuntu1.2

Ubuntu 22.04 LTS:
libuutil3linux 2.1.5-1ubuntu6~22.04.2
zfsutils-linux 2.1.5-1ubuntu6~22.04.2

Ubuntu 20.04 LTS:
libuutil1linux 0.8.3-1ubuntu12.16
zfsutils-linux 0.8.3-1ubuntu12.16

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

References:
https://ubuntu.com/security/notices/USN-6511-1
CVE-2013-20001

Package Information:
https://launchpad.net/ubuntu/+source/zfs-linux/2.1.9-2ubuntu1.2
https://launchpad.net/ubuntu/+source/zfs-linux/2.1.5-1ubuntu6~22.04.2
https://launchpad.net/ubuntu/+source/zfs-linux/0.8.3-1ubuntu12.16