Multiple vulnerabilities have been identified in the Xen hypervisor that could allow attackers to elevate privileges, cause remote denial‑of‑service, and compromise data confidentiality. The vulnerabilities affect Xen running on Linux kernels newer than 4.12 without the xsa485-linux.patch, Xen on x86 or Arm PVH/HVM systems with kernels newer than 3.8 without xsa487-linux.patch, and a range of Xen versions 4.17.x through 4.19.x that lack various patch updates (xsa483, xsa486, xsa484, etc.). The announcement references CVE‑2026‑23556 through CVE‑2026‑42486 and lists six Xen security advisories issued on 28 April 2026. System administrators are advised to consult the corresponding Xen advisory pages and apply the available security patches promptly.
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