I got hit by this bug in a server running an old kernel. Found that there's a patch: https://lkml.org/lkml/2018/8/20/172 And found that it was already applied in a later kernel (version 4.9.130-1). From the changelog: - [x86] speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit So this is already fixed in both stretch and buster. -- Jorge Barreiro González aCore jbarreiro@acore.es http://www.acore.es Tel. 881 927 189