highmem

The highmem tag on WindowsForum.com covers discussions about the Linux kernel's HIGHMEM memory management subsystem, particularly in the context of bug fixes and security vulnerabilities. Recent content focuses on CVE-2025-68231, a vulnerability in the mempool poisoning path that caused kernel page faults on systems with CONFIG_HIGHMEM enabled. The tag includes technical details about how the kernel maps and poisons subpages of high-order allocations, and the patches that prevent out-of-bounds writes and OOPS errors. While the tag is Linux-specific, it is relevant to Windows users and IT professionals who manage mixed-OS environments or are interested in kernel-level memory management issues.