CVE-2022-23034

Name of the Vulnerable Software and Affected Versions Xen (affected versions not specified)

Description A PV guest could cause a denial of service (DoS) in Xen while unmapping a grant. This issue arises from the introduction of reference counting for grant mappings when a PV guest has the IOMMU enabled. PV guests can request two forms of mappings, and when both are in use for an individual mapping, unmapping can be requested in two steps. The reference count for such a mapping would then be mistakenly decremented twice, leading to an underflow of the counters. This underflow triggers a hypervisor bug check.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.