A vulnerability has been found in Xen (Virtualization Software) (the affected version is unknown) and classified as problematic. Affected by this vulnerability is an unknown code of the component Xenstore Node Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Xenstore: Cooperating guests can create arbitrary numbers of nodes T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Since the fix of XSA-322 any Xenstore node owned by a removed domain will be modified to be owned by Dom0. This will allow two malicious guests working together to create an arbitrary number of Xenstore nodes. This is possible by domain A letting domain B write into domain A's local Xenstore tree. Domain B can then create many nodes and reboot. The nodes created by domain B will now be owned by Dom0. By repeating this process over and over again an arbitrary number of nodes can be created, as Dom0's number of nodes isn't limited by Xenstore quota.

The weakness was shared 11/01/2022. The advisory is shared at xenbits.xen.org. This vulnerability is known as CVE-2022-42322 since 10/03/2022. Neither technical details nor an exploit are publicly available.

Applying a patch is able to eliminate this problem.

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• Virtualization Software

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• Xen

License

• open-source

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