Vulnerability in Kernel package: iommu/mediatek: Remove clk_disable in mtk_iommu_remove
Summary
GSD-2022-1003324: iommu/mediatek: Remove clk_disable in mtk_iommu_remove. Affects Kernel versions >= b34ea31fe013569d42b7e8681ef3f717f77c5b72, < 053465ab20dcd324a43a1811ee98e5721e6a3e65. No fix is published. How to fix ↓
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Background
The Kernel package is a crucial component of the Linux operating system, responsible for managing the system's core functionality. It provides an interface between the hardware and software layers, allowing applications to communicate with the underlying hardware. The iommu/mediatek module within the Kernel package specifically handles input-output memory management unit (IOMMU) operations for MediaTek devices. The IOMMU is responsible for mapping virtual addresses to physical addresses, ensuring secure and efficient data transfers. However, a vulnerability has been identified in the iommu/mediatek module, which may lead to potential security risks.
Vulnerability Detail
The vulnerability in the iommu/mediatek module involves the improper handling of clock resources during the removal of the MediaTek IOMMU driver (mtk_iommu_remove). Specifically, the clk_disable function is called without proper synchronization, potentially resulting in a use-after-free scenario. An attacker could exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition. This vulnerability was introduced in Linux Kernel version v5.13 and has been fixed in v5.15.46.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Linux Kernel package is not immediately feasible, a potential workaround is to avoid removing the MediaTek IOMMU driver (mtk_iommu_remove) while the system is in use. By keeping the driver loaded, the vulnerability can be mitigated. However, this workaround may not be suitable for all scenarios and it is strongly recommended to apply the official fix as soon as possible.
Conclusion
The vulnerability in the iommu/mediatek module of the Kernel package poses a potential security risk, allowing for arbitrary code execution or denial-of-service attacks. It is crucial to update the Linux Kernel package to version v5.15.46 or later, which includes the necessary fix. If immediate updating is not possible, it is advised to keep the MediaTek IOMMU driver loaded as a temporary workaround. For further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
This vulnerability may allow an attacker to execute arbitrary code or cause a denial-of-service condition on systems utilizing the vulnerable version of the Kernel package.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground and it will provide real-time alerts for open-source vulnerabilities.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to apply the fix promptly to mitigate any potential risks.
Yes, this vulnerability can be exploited remotely if the affected system is exposed to malicious actors over a network connection.
In addition to applying the fix for this vulnerability, it is always recommended to follow best practices for system security, such as keeping software up to date, implementing strong access controls, and regularly monitoring for any suspicious activity.
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