Fix for event handling soft lockup in iommu/arm-smmu-v3
Summary
GSD-2022-1001067: iommu/arm-smmu-v3: fix event handling soft lockup. Affects Kernel versions < b2c6557c2f4ea9a5b1a0d4f31679d8ed92eae006. 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 event handling functionality of the arm-smmu-v3 module, potentially leading to a soft lockup.
Vulnerability Detail
The vulnerability in the iommu/arm-smmu-v3 module can result in a soft lockup, causing the system to become unresponsive. This occurs due to a flaw in the event handling code, which can be triggered under certain conditions. An attacker may exploit this vulnerability to cause a denial-of-service (DoS) situation or disrupt the normal operation of the system. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. Users are advised to update their Linux Kernel to the fixed version as mentioned in the 'how_to_fix' section.
Conclusion
The iommu/arm-smmu-v3 module in the Linux Kernel is vulnerable to a soft lockup issue in its event handling code. This vulnerability can potentially lead to a denial-of-service (DoS) situation or disruption of system operation. Users should update their Linux Kernel to version v5.17.3 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The iommu/arm-smmu-v3 module is a component of the Linux Kernel that provides support for Input-Output Memory Management Units (IOMMUs) on ARM-based systems. It manages memory access and translation for devices connected to the system.
A soft lockup refers to a situation where a CPU appears to be stuck in a loop or busy-waiting state, causing the system to become unresponsive. It is different from a hard lockup, which typically involves a complete system freeze.
The impact of this vulnerability is a potential denial-of-service (DoS) situation or disruption of normal system operation. However, the actual impact and attack plausibility have not been proven yet.
To fix this vulnerability, users should update their Linux Kernel to version v5.17.3 or later. This can be done by downloading the updated kernel source code from the official Linux Kernel repository and compiling it for their specific system.
No specific workaround is mentioned for this vulnerability. Updating the Linux Kernel to the fixed version is the recommended solution.
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