CVE-2026-74355

Received Received - Intake

Linux Kernel RB-Tree Corruption in IOMMU/vt-d Driver

Publication date: 2026-08-15

Last updated on: 2026-08-17

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix RB-tree corruption in probe error path The info->node RB-tree member is zero-initialized via kzalloc. If a device does not support ATS, the device_rbtree_insert() call is skipped. If a subsequent probe step fails, the error path jumps to device_rbtree_remove(), which misinterprets the zeroed node as a tree root and corrupts the device RB-tree. Fix this by explicitly initializing the RB-node as empty using RB_CLEAR_NODE() during initialization and guarding the removal with RB_EMPTY_NODE().

CVSS Scores

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Meta Information

Published

2026-08-15

Last Modified

2026-08-17

Generated

2026-09-04

AI Q&A

2026-08-15

EPSS Evaluated

2026-09-03

NVD

CVE-2026-74355

EUVD

EUVD-2026-59502

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a Linux kernel vulnerability where an RB-tree corruption occurs during device probe error handling. The info->node RB-tree member is zero-initialized but if a device lacks ATS support, device_rbtree_insert() is skipped. When a later probe step fails, device_rbtree_remove() incorrectly treats the zeroed node as a tree root, corrupting the device RB-tree.

Detection Guidance

This vulnerability is specific to the Linux kernel's IOMMU subsystem and may not have direct network detection methods. Check kernel logs for IOMMU-related errors or RB-tree corruption messages using dmesg or journalctl commands.

Impact Analysis

This vulnerability could lead to system instability or crashes due to corrupted RB-tree data structures in the IOMMU subsystem. It may cause devices to malfunction or fail to initialize properly, potentially disrupting normal system operations.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a low-level kernel memory corruption issue in the IOMMU subsystem. Compliance impacts would depend on system configuration and usage rather than this specific vulnerability itself.

Mitigation Strategies

Update your Linux kernel to the patched version that includes the fix for this RB-tree corruption issue. Monitor kernel logs for IOMMU-related errors after applying updates.

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