During October 2025, Siyu Tao focused on security hardening and correctness improvements for the DataDog/kata-containers repository. Working in Rust and leveraging system programming expertise, Siyu addressed a vulnerability in KVM IOCTL handling by upgrading the kvm-ioctls dependency to version 0.12.1, thereby reducing the virtualization device attack surface. The work also included updating the Create_Device logic to use ioctl_with_mut_ref, ensuring proper struct handling and preventing potential misuse during device creation. These targeted changes improved the stability and maintainability of virtualization workloads, demonstrating depth in low-level systems engineering and a careful approach to dependency management and code correctness.