CVE-2022-42330 Denial of service in xen

High 7.5 Published 26 Jan 2023 Updated 3 Aug 2024

A guest VM can crash the Xenstore daemon by issuing a soft reset, causing a denial of service for the hypervisor management plane.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2022-42330?

CVE-2022-42330 is a high-severity denial of service vulnerability in Xen Xen, published on 26 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Guests can cause Xenstore crash via soft reset When a guest issues a "Soft Reset" (e.g. for performing a kexec) the libxl based Xen toolstack will normally perform a XS_RELEASE Xenstore operation. Due to a bug in xenstored this can result in a crash of xenstored. Any other use of XS_RELEASE will have the same impact.

Which versions are affected by CVE-2022-42330?

It affects 1 product.

Linux distribution packages (1)

xen openSUSE:Tumbleweed All versions 4.17.0_04-1.1

Products include Xen Xen.

How do I fix CVE-2022-42330?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-42330 being exploited?

There is no known exploitation of CVE-2022-42330 in the wild and no public exploit code.

All Xen Xen vulnerabilities

Sources

Also known as ALPINE-CVE-2022-42330, DEBIAN-CVE-2022-42330, GHSA-jvpr-73pr-x7v5, UBUNTU-CVE-2022-42330, openSUSE-SU-2024:12644-1.