hardened usercopy

The hardened usercopy tag on WindowsForum.com covers discussions about Linux kernel memory safety mechanisms, specifically the CONFIG_HARDENED_USERCOPY feature that adds runtime bounds checking to copy operations between kernel and user space. Content includes analysis of CVE-2026-22977, a vulnerability causing a hardened usercopy panic in the sock_recv_errqueue function when processing TCP socket error queues. This defect leads to deterministic kernel panics on systems with usercopy hardening enabled, affecting availability. The tag focuses on kernel security patches, stable tree backports, and practical implications for system administrators managing Linux distributions. While the tag name references a Linux kernel feature, it appears in a Windows-focused forum context, likely for cross-platform security discussions.