CLSA-2025-1759864776 Fix CVE(s): CVE-2025-6020

SECURITY UPDATE: fix privilege escalation in pamnamespace - debian/patches-applied/CVE-2025-6020-pre.patch: prerequisite changes - debian/patches-applied/CVE-2025-6020.patch: enforce proper handling of instance directory symlinks to prevent mounting arbitrary paths - CVE-2025-6020...