CVE-2026-74551
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, the hwmon nzxt-smart2 driver had an output buffer not aligned to DMA boundaries, which on architectures with non-coherent caches (e.g., ARM, MIPS) led to memory corruption during DMA mapping. The fix aligns the buffer to ARCH_DMA_MINALIGN.
Risk Assessment
Operations such as setting fan speed can cause memory corruption, potentially leading to system crash or instability.
Recommendation
Apply the kernel patch that aligns the output buffer to ARCH_DMA_MINALIGN to avoid memory corruption.
Original NVD description (English source)
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.