{"id":"CVE-2026-74551","summary":"hwmon: (nzxt-smart2) DMA-align output buffer","details":"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.","modified":"2026-08-21T03:30:13.780219453Z","published":"2026-08-15T12:27:58.237Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74551.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2332d35aaf206c17acf848522817252732596676"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a2dbce5da2d2163a5b684acf68a0e54582ff0fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70ad543ce81f368411b6c721265a3b2d7ab4fda4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/81a6593b1c8dfb2694cd0ce39be01212d2b8436c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74551.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74551"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"53e68c20aeb1e23419bed811aa3a309ceda200f9"},{"fixed":"81a6593b1c8dfb2694cd0ce39be01212d2b8436c"},{"fixed":"70ad543ce81f368411b6c721265a3b2d7ab4fda4"},{"fixed":"51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f"},{"fixed":"2332d35aaf206c17acf848522817252732596676"},{"fixed":"6a2dbce5da2d2163a5b684acf68a0e54582ff0fa"},{"fixed":"080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74551.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74551.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}