4. Techniques 4.1. Page refcount juggling The first technique required for the exploit is juggling page refcounts. When we attempt to double-free a page in the kernel using the dedicated API functions, the kernel will check the refcount of the page: Codeblock 4.1.1: C code … Continue reading Flipping Pages: An analysis of a new Linux vulnerability in nf_tables and hardened exploitation techniques-Part II