Memory Management Vulnerability in Linux Kernel Affecting High-Memory Pages
CVE-2025-68231

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 16 December 2025

What is CVE-2025-68231?

A memory management vulnerability in the Linux kernel has been identified, which affects the handling of HIGHMEM pages. This issue arises when the poisoning code fails to adequately manage high-order pages due to improper mappings. As a result, the kernel may encounter a critical page fault ('unable to handle page fault') when attempting to access these pages. Efforts to remediate this issue include implementing a loop to correctly map and access individual pages, ensure proper poisoning, and unmap them when necessary. This vulnerability poses significant risks to system stability and could potentially lead to exploitation under certain conditions.

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