{"cve":"CVE-2026-74551","nvd":{"published":"2026-08-15T13:18:00.500","modified":"2026-08-19T17:21:10.190","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (nzxt-smart2) DMA-align output buffer\n\nSashiko reports:\n\nWhen send_output_report() calls hid_hw_output_report(), the underlying USB\nHID core calls usb_interrupt_msg() which maps this buffer directly for DMA.\n\nWhen the DMA mapping flushes or invalidates the cacheline, it will corrupt\nthe adjacent variables (mutex, update_interval) that were modified\nconcurrently by the CPU. This causes memory corruption due to cacheline\nsharing on non-coherent CPU architectures (such as ARM or MIPS). The DMA\nAPI debugging tool (CONFIG_DMA_API_DEBUG) will trigger runtime warnings\nfor this violation.\n\nAny operation that triggers send_output_report() (like setting a fan speed\nor updating the interval) causes the USB DMA mapping. On systems with\nnon-coherent caches, this structural bug causes immediate and deterministic\nmemory corruption.\n\nAlign the output buffer to ARCH_DMA_MINALIGN to fix the problem.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8","https://git.kernel.org/stable/c/2332d35aaf206c17acf848522817252732596676","https://git.kernel.org/stable/c/51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f","https://git.kernel.org/stable/c/6a2dbce5da2d2163a5b684acf68a0e54582ff0fa","https://git.kernel.org/stable/c/70ad543ce81f368411b6c721265a3b2d7ab4fda4"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:10.689564601+00:00"},"epss":{"cve":"CVE-2026-74551","score":0.00129,"percentile":0.0254,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}