IRQ Domain Flaws in Intel SOC PMIC Driver Affecting Linux Kernel

CVE-2024-56724

Summary

The vulnerability involves shortcomings in the implementation of the Intel SOC PMIC driver within the Linux kernel, particularly concerning IRQ domain handling. It was identified that the approach to converting the driver to utilize the IRQ chip hierarchy, while conceptually sound, was marred by inherited flaws. Specifically, platform_get_irq() generated warnings related to IRQ 0, which should adhere to Linux IRQ number standards. As a result, there is a need to revise the driver architecture to correctly respect IRQ domains on a per-MFD device basis, since the IRQ domains differ across devices. This oversight could lead to unexpected behavior in multi-device configurations, affecting overall kernel stability and performance.

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