CVE-2025-27466
Description
A NULL pointer dereference vulnerability exists in Xen’s viridian implementation when updating the reference TSC area. A malicious x86 HVM guest with the reference_tsc viridian extension enabled could trigger this flaw, resulting in a host denial of service (crash).
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
Disabling the reference_tsc viridian extension for x86 HVM guests prevents exploitation of this issue.
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU)
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