CLSA-2023-1686651204 kernel: Fix of 25 CVEs

cgroup: Use open-time cgroup namespace for process migration perm checks CVE-2021-4197 - cgroup: Use open-time credentials for process migraton perm checks CVE-2021-4197 - vt: drop old FONT ioctls CVE-2021-33656 - fbmem: Check virtual screen sizes in fbsetvar CVE-2021-33655 - fbcon: Prevent that...