Dirty Page Tracking Bypass in Linux Kernel IOMMU

Executive Summary

This vulnerability in the Linux kernel involves a flaw in the Input-Output Memory Management Unit (IOMMU) subsystem, specifically with Intel's Virtualization Technology for Directed I/O (VT-d). The issue occurs when a PASID (Process Address Space ID) is attached to a nested domain that supports dirty tracking. The kernel fails to block this attachment properly, which could lead to loss of dirty page tracking in nested domains.

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Detection Guidance

This vulnerability is specific to the Linux kernel's IOMMU subsystem and requires kernel-level inspection. Detection involves checking kernel logs for IOMMU-related errors or verifying if nested PASID domains are improperly configured. Commands like dmesg | grep -i iommu or journalctl -k | grep -i pasid may help identify related errors.

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Impact Analysis

If exploited, this vulnerability could allow an attacker to bypass memory isolation mechanisms, potentially leading to unauthorized access to sensitive data or privilege escalation. Systems using VT-d with nested virtualization and dirty tracking enabled are at risk of memory corruption or data loss.

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Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it pertains to a low-level kernel memory management issue without clear implications for data protection or privacy regulations.

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Mitigation Strategies

Update the Linux kernel to a patched version that resolves this vulnerability. Check your distribution's security advisories for the latest kernel updates addressing CVE-2026-53372.

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