A Linux PTP security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, and 20.04 LTS.

[USN-6097-1] Linux PTP vulnerability

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Ubuntu Security Notice USN-6097-1
May 29, 2023

linuxptp vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Linux PTP could be made to crash, run arbitrary code, or expose
sensitive information if it received specially crafted input.

Software Description:
- linuxptp: Precision Time Protocol (PTP, IEEE1588) implementation for Linux

Details:

It was discovered that Linux PTP did not properly perform a length check
when forwarding a PTP message between ports. A remote attacker could
possibly use this issue to access sensitive information, execute
arbitrary code, or cause a denial of service.

Update instructions:

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

Ubuntu 20.04 LTS:
linuxptp 1.9.2-1ubuntu0.1

Ubuntu 18.04 LTS:
linuxptp 1.8-1ubuntu0.1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
linuxptp 1.6-1ubuntu0.1~esm1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6097-1
CVE-2021-3570

Package Information:
https://launchpad.net/ubuntu/+source/linuxptp/1.9.2-1ubuntu0.1
https://launchpad.net/ubuntu/+source/linuxptp/1.8-1ubuntu0.1