SUSE-SU-2026:2668-1 Security update for xen

This update for xen fixes the following issues: - CVE-2026-42487: xen: x86 HVM I/O port list traversal XSA-491 bsc1266952. - CVE-2026-42488: xen: x86: mismatched mapcache metadata XSA-494 bsc1266955. - CVE-2026-42489,CVE-2026-42490: xen: domctl lock open to abuse XSA-492 bsc1266953...