CVE-2026-89452

Received Received - Intake

Memory Corruption in Linux Kernel IOMMU Driver

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/msm: Unwind probe state on registration failure msm_iommu_probe() adds its devm-managed IOMMU object to qcom_iommu_devices before adding the IOMMU sysfs device and registering it with the IOMMU core. If iommu_device_sysfs_add() fails, probe returns with the object still on qcom_iommu_devices. The driver core then releases the devm allocation, leaving a dangling list entry that later list walks may dereference. If iommu_device_register() fails, the same dangling list entry remains and the sysfs device is left registered as well. Unwind the sysfs device and global list entry in reverse setup order on the corresponding failure paths.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-11

Last Modified

2026-09-11

Generated

2026-09-12

AI Q&A

2026-09-12

EPSS Evaluated

N/A

NVD

CVE-2026-89452

EUVD

EUVD-2026-76358

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 the msm_iommu_probe function adds an IOMMU device to a global list before completing its setup. If setup fails at certain points, the device remains on the list but is no longer properly managed, creating a dangling entry that could be accessed later, leading to potential crashes or undefined behavior.

Detection Guidance

This vulnerability is specific to the Linux kernel's IOMMU subsystem, particularly in Qualcomm devices. Detection requires checking kernel logs for IOMMU probe failures or system crashes related to msm_iommu_probe. Use commands like dmesg | grep msm_iommu or journalctl -k | grep msm_iommu to identify issues.

Impact Analysis

This vulnerability could cause system instability, crashes, or unpredictable behavior if the kernel tries to access a corrupted or dangling IOMMU device entry. It primarily affects systems using Qualcomm IOMMU devices with the affected Linux kernel versions.

Mitigation Strategies

Update the Linux kernel to the latest patched version where this issue is resolved. If immediate patching is not possible, avoid using Qualcomm IOMMU devices or disable affected IOMMU functionality via kernel parameters until the update is applied.

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