CVE-2024-56724 is a vulnerability identified in the Linux kernel specifically related to the multi-function device (MFD) driver for the Intel SoC PMIC (Power Management IC) BXTWC. The issue arises from the incorrect handling of IRQ (Interrupt Request) domains within the driver implementation. The vulnerability stems from a flawed design where the driver attempts to convert to using a hierarchy of IRQ chips but inherits implementation errors. Specifically, the platform_get_irq() function triggers warnings when IRQ 0 is used, which is expected to be a valid Linux IRQ number (also known as vIRQ). The root cause is that the driver does not correctly respect the IRQ domain when creating each MFD device separately, assuming the domain is uniform across devices, which it is not. This mismanagement of IRQ domains can lead to improper interrupt handling, potentially causing system instability or malfunction of the affected hardware components. The vulnerability was resolved by reworking the driver to correctly handle IRQ domains for each MFD device independently, ensuring proper interrupt routing and handling. The affected versions are identified by a specific commit hash repeated multiple times, indicating the flaw exists in a particular code state of the Linux kernel. No known exploits are currently reported in the wild, and no CVSS score has been assigned yet. The vulnerability is technical and low-level, affecting kernel interrupt management for specific Intel SoC PMIC devices integrated in Linux systems.

For European organizations, the impact of CVE-2024-56724 depends largely on the deployment of Linux systems running on Intel SoC platforms that utilize the PMIC BXTWC device. This vulnerability could lead to improper interrupt handling, which may cause device malfunctions, degraded system performance, or potential system instability. In critical infrastructure environments, such as telecommunications, industrial control systems, or embedded systems used in manufacturing and automotive sectors, this could translate into operational disruptions or reduced reliability. Although no direct exploit is known, the flaw could be leveraged in targeted attacks to cause denial of service or to facilitate further kernel-level exploits if combined with other vulnerabilities. Organizations relying on Linux-based embedded devices or servers with affected hardware should be aware of potential risks to system availability and integrity. The vulnerability does not appear to directly expose confidentiality risks but could indirectly affect system integrity and availability.

To mitigate CVE-2024-56724, organizations should prioritize updating their Linux kernel to the patched version where the driver has been reworked to correctly handle IRQ domains. This involves applying the latest kernel updates from trusted Linux distributions that include the fix. For embedded systems or custom Linux builds, developers should ensure the driver code for the intel_soc_pmic_bxtwc device is updated according to the patch. Additionally, organizations should audit their hardware inventory to identify systems using the affected Intel SoC PMIC BXTWC devices and assess their exposure. Implementing rigorous testing of kernel updates in staging environments before deployment can prevent unexpected system behavior. Monitoring system logs for IRQ warnings or anomalies related to interrupt handling can help detect potential exploitation attempts or instability. Since no known exploits exist, maintaining strong system hardening and limiting physical and remote access to critical Linux systems will reduce the attack surface. Collaboration with hardware vendors for firmware updates and guidance is also recommended.