Fix for event handling soft lockup in iommu/arm-smmu-v3

Kernel Updated 02 Oct 2025

Summary

24/04/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1002321: iommu/arm-smmu-v3: fix event handling soft lockup. Affects Kernel versions < b58e90be71733a11e0c3d0237d48934a8c7f3ad2. No fix is published. How to fix ↓

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Background

The iommu/arm-smmu-v3 is a component of the Linux Kernel that provides support for Input-Output Memory Management Units (IOMMUs) on ARM-based systems. It is responsible for managing memory access and translation for devices connected to the system. The arm-smmu-v3 module specifically handles event handling related to IOMMU operations. This vulnerability affects the arm-smmu-v3 module in the Linux Kernel.

Vulnerability Detail

The vulnerability in the iommu/arm-smmu-v3 module can lead to a soft lockup in event handling. A soft lockup occurs when a CPU is stuck in a loop or busy-waiting state for an extended period, causing the system to become unresponsive. This vulnerability can be exploited by an attacker to cause a denial-of-service (DoS) condition on the affected system. The issue has been addressed in Linux Kernel version v4.19.238 by commit b58e90be71733a11e0c3d0237d48934a8c7f3ad2.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Linux Kernel to version v4.19.238 or later. This can be done by fetching the latest kernel source code from the official Linux Kernel repository and compiling it for the target system. Alternatively, users can wait for their Linux distribution to provide an updated package containing the fix.

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Conclusion

The iommu/arm-smmu-v3 module in the Linux Kernel is vulnerable to a soft lockup in event handling. This can lead to a denial-of-service condition on the affected system. It is recommended to update the Linux Kernel to version v4.19.238 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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