CVE-2022-42323

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.

Notes