XCP-ng 8.3 updates announcements and testing

flakpyro

@gduperrey No issues to report on my test systems.

gduperrey

Thank you everyone for your tests and your feedback!

The updates are live now: https://xcp-ng.org/blog/2026/03/19/march-2026-security-updates-for-xcp-ng-8-3-lts/

manilx

@gduperrey reboot necessary?

stormi

@manilx Yes, as written

manilx

@stormi didn't see that (my old eyes)... guessed so anyway

acebmxer

@gduperrey

When applying updates at work. I started with first pool and choose the rolling pool updates and ran into issue after fist host came back up the second host didnt enter maintenance mode and the operation appeared to have just stopped. I then manually put host 2 in maintenance mode and applied updates. Once updates finished it restated the tool stack and took the host out of maintenance mode. I put it back into maintenance mode and rebooted the host. Once it came backup no migration occurred as expected to bring vms back to host2.

Moved on to pools 2 and 3 and just did everything manually. Each time load balance appears to be broken now just like home lab.

I have rebooted XOA deleted load balance config. rebuilt using different name and still no load balance.

Once manually migrated vms back over to second host in all three pools all seems ok.

gduperrey

@acebmxer Hello,

What you're describing sounds more like an RPU issue with Xen-Orchestra than a problem related to XCP-ng updates. But I could be wrong

However, since these updates affect Xen, a reboot was clearly indicated in our procedure. So a simple restart of the toolstack isn't enough. You did the right thing by rebooting afterward.

Are you using XO Appliance or from source?

If it's XO Appliance, you can open a ticket to ask for help analyzing the situation and see if anything in the logs or configuration explains this behavior.

If it's from source, for the same issue, I would suggest you start a separate thread on the forum so other users can help you with the analysis

In any case, it's great if your pool is working in the end

acebmxer

@gduperrey

Thank you for the reply. Work uses XOA.

Edit - Support ticket created - Ticket#7755004

gduperrey

@acebmxer I invite you to open a ticket through the support ticketing system.

I do not connect remotely myself and I am also unable to provide support for Xen-Orchestra.

gduperrey

New security update candidate for you to test!

A new security vulnerability has been detected and fixed for xen.

This was introduced by an upstream commit, and detected before the Xen Project did any new release. Therefore this does not impact any upstream release, and there is no Xen Security Advisory this time. But that change was backported into XCP-ng xen package, therefore XCP-ng is impacted.

Security updates

xen: Fix a security issue where insufficient memory sanitization during guest creation can lead to information leakage from previous guests and potential privilege escalation

Test on XCP-ng 8.3

yum clean metadata --enablerepo=xcp-ng-testing,xcp-ng-candidates
yum update --enablerepo=xcp-ng-testing,xcp-ng-candidates
reboot

The usual update rules apply: pool coordinator first, etc.

Versions:

xen: 4.17.6-5.2.xcpng8.3

What to test

Normal use and anything else you want to test.

Test window before official release of the updates

~2 days