owards a Formally Secure eBPF - Frédéric Besson eBPF is a technology for running user-provided code with kernel privileges. Originally designed to perform in-kernel packet filtering, eBPF has gained traction and eBPF scripts may be hooked in various sub-systems of the Linux kernel. They provide a versatile way to extend the kernel without sacrificing its integrity. In this talk, I will present an overview of the eBPF ecosystem, notably the verifier which is the sentry of the kernel. I will discuss current formalisation efforts regarding the semantics of eBPF, its verifier and its JIT compiler.