Linux Kernel Memory Management Vulnerability in PMD Huge Page Mappings

CVE-2026-80582

What is CVE-2026-80582?

A vulnerability in the Linux kernel's memory management system has been identified, specifically related to the handling of PMD (Page Medium Directory) huge page mappings. This issue involves a failure to properly check the Virtual Memory Area (VMA) boundaries in the ->huge_fault handler, which could potentially allow for improper mapping of huge pages. The integrity of the system could be compromised if these boundaries are exceeded, leading to unexpected behavior and potential system instability. The vulnerability has been addressed in subsequent updates, ensuring that the ->huge_fault handler enforces correct VMA boundary checks to mitigate these risks. Users are advised to update their systems to the latest kernel versions to enhance security.

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