Refcount Leak in build_fiq_affinity in Kernel
Summary
GSD-2022-1004301: irqchip/apple-aic: Fix refcount leak in build_fiq_affinity. Affects Kernel versions >= a5e8801202b318622ea526aa5625e5f7eceb4d26, < 2dc14cebe5dc053434b507bb24e6821cb795050f. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software. It provides essential services and functions for the proper functioning of the system. The build_fiq_affinity function in the irqchip/apple-aic module is responsible for constructing the Fast Interrupt Request (FIQ) affinity for Apple AIC (Apple Interrupt Controller) devices. This feature ensures efficient handling of interrupts on Apple devices. However, a refcount leak vulnerability has been identified in this function.
Vulnerability Detail
The refcount leak vulnerability in build_fiq_affinity allows an attacker to cause a reference count leak, leading to a resource exhaustion condition. By repeatedly triggering the vulnerability, an attacker can exhaust system resources, potentially resulting in a denial-of-service (DoS) scenario. The vulnerability was introduced in version v5.18 of the Linux Kernel and was fixed in version v5.18.6. 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 known workaround available for this vulnerability. It is essential to apply the patch provided in the updated version of the Linux Kernel to mitigate the risk.
Conclusion
The refcount leak vulnerability in build_fiq_affinity in the Kernel can lead to a resource exhaustion condition, potentially resulting in a denial-of-service scenario. It is crucial to update the Linux Kernel to version v5.18.6 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a resource exhaustion condition, potentially resulting in a denial-of-service (DoS) scenario.
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At the time of this report, there is no known exploit for this vulnerability. However, it is crucial to apply the recommended patch to mitigate any potential risks.
The details regarding remote exploitation of this vulnerability have not been disclosed. However, it is always advisable to keep systems up to date with the latest security patches to minimize the risk of remote exploitation.
No alternative solutions are available for this vulnerability. Updating the Linux Kernel to the recommended version is the most effective way to address the issue.
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