CVE-2024-56691: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-56691 affects the Linux kernel's Intel SoC PMIC BXTWC driver implementation. The vulnerability was discovered when platformgetirq() started generating WARN() messages on IRQ 0, which should be a Linux IRQ number (vIRQ). The issue stems from flaws in the implementation of converting the driver to use the hierarchy of IRQ chips (Kernel Git).

The vulnerability exists in the Intel SoC PMIC BXTWC driver's IRQ domain handling for USB Type-C devices. The implementation incorrectly handled the IRQ domain hierarchy when creating MFD devices, as the domain is not the same for all of them. This affects the driver's ability to properly manage interrupt requests for USB Type-C devices (Kernel Git).

The vulnerability affects the proper functioning of USB Type-C devices on systems using the Intel SoC PMIC BXTWC driver. When exploited, it could lead to improper interrupt handling for USB Type-C devices (NVD).

The issue has been fixed in the Linux kernel through a patch that reworks the driver to properly respect IRQ domain when creating each MFD device separately. The fix has been implemented in various kernel versions including 6.11.0-18.18 for Ubuntu 24.10 (Ubuntu Security).