CLSA-2026-1777482797 Fix CVE(s): CVE-2026-29111

SECURITY UPDATE: stack overwriting via crafted cgroup path - debian/patches/CVE-2026-29111.patch: validate input cgroup path in methodgetunitbycontrolgroup with pathisabsolute and pathisnormalized checks before passing to managergetunitbycgroup. - CVE-2026-29111...