CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's hwmon subsystem, specifically within the nzxt-smart2 driver, where improper DMA alignment of the output buffer can lead to memory corruption on non-coherent CPU architectures like ARM or MIPS. This occurs when concurrent modifications by the CPU corrupt adjacent variables during DMA operations, potentially leading to system instability or crashes. Organizations using affected Linux systems, particularly those with non-coherent architectures, should prioritize addressing this issue to prevent potential exploitation and ensure system reliability.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: (nzxt-smart2) DMA-align output buffer Sashiko reports: When send_output_report() calls hid_hw_output_report(), the underlying USB HID core calls usb_interrupt_msg() which maps this buffer directly for DMA. When the DMA mapping flushes or invalidates the cacheline, it will corrupt the adjacent variables (mutex, update_interval) that were modified concurrently by the CPU. This causes memory corruption due to cacheline sharing on non-coherent CPU architectures (such as ARM or MIPS). The DMA API debugging tool (CONFIG_DMA_API_DEBUG) will trigger runtime warnings for this violation. Any operation that triggers send_output_report() (like setting a fan speed or updating the interval) causes the USB DMA mapping. On systems with non-coherent caches, this structural bug causes immediate and deterministic memory corruption. Align the output buffer to ARCH_DMA_MINALIGN to fix the problem.