Legacy Mode Vulnerability in Linux Kernel Affecting Multiple Versions

CVE-2025-40155

What is CVE-2025-40155?

A vulnerability exists in the debugfs for the IOMMU in the Linux kernel, specifically affecting legacy mode page table dump logic. When the translation type (TT) is not set to 00b or 01b, the SSPTPTR may remain uninitialized or set to zero, potentially leading to a critical system fault. This can result in a general protection fault for non-canonical addresses, disrupting system operations. Proper measures should be taken to avoid accessing the page table under these circumstances to maintain system stability.

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