update to xen-4.19.3 includes patches for x86: Incorrect stubs exception handling for flags recovery [XSA-470, CVE-2025-27465] x86: Transitive Scheduler Attacks [XSA-471, CVE-2024-36350,

Source: Fedora 42: Xen Critical Exceptions and Scheduler Attacks 2025-ddaa63a0f5