By Oliver Sieber Overview In this blog post, we discuss a use-after-free vulnerability that we found in the nftables subsystem of the Linux kernel in early 2025. This vulnerability was patched upstream on 5 February 2026 and assigned CVE-2026-23111. This blog post covers a technical analysis of the vulnerability and how we exploited it to perform a local … Continue reading Off By !: Exploiting a Use-after-Free in the Linux Kernel