April 2026 monthly summary for zephyrproject-rtos/zephyr focusing on security hardening and portability improvements. Delivered two high-impact features: (1) Kernel Object Access Revocation API to revoke access to kernel objects from all threads except the caller, enabling safer object reassignment and tighter permission controls, and (2) Default Entropy Device Retrieval Inline Function to support architectural entropy drivers without a device tree node, improving cross-platform entropy support. Each feature was implemented with targeted commits and signed-off contributions, reinforcing code quality and security posture. These changes lay groundwork for safer resource management and broader hardware compatibility across architectures.

March 2026 monthly summary for nxp-upstream/zephyr focused on security hardening, permissions safety, and architectural portability. Delivered three major features with clear business value: improved memory safety and attack resistance through randomized heap canaries with reduced overhead and an explicit RNG dependency; enhanced userspace security via a new object access check syscall and accompanying tests; and expanded RISC-V architecture support with 64 PMP registers to align with official specifications and improve hardware compatibility across targets.

December 2025: Delivered ARM64 RNG support for entropy and random subsystems in Zephyr, enabling hardware-assisted randomness via RNDRRS and RNDR. This enhances cryptographic readiness, reduces entropy bootstrap time, and improves system security and performance.