CVE-2025-27466 — Xen Xen: A NULL pointer dereference in the updating of the reference TSC area.
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] There are multiple issues related to the handling and accessing of guest memory pages in the viridian code: 1. A NULL pointer dereference in the updating of the reference TSC area. This is CVE-2025-27466. 2. A NULL pointer dereference by assuming the SIM page is mapped when a synthetic timer message has to be delivered. This is CVE CVSSv3.1 9.8 (CRITICAL) · EPSS 39th percentile