{"api_version":"1","generated_at":"2026-08-16T06:03:07+00:00","cve":"CVE-2026-74551","urls":{"html":"https://cve.report/CVE-2026-74551","api":"https://cve.report/api/cve/CVE-2026-74551.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74551","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74551"},"summary":{"title":"hwmon: (nzxt-smart2) DMA-align output buffer","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:18:00","updated_at":"2026-08-15 13:18:00"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f","name":"https://git.kernel.org/stable/c/51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6a2dbce5da2d2163a5b684acf68a0e54582ff0fa","name":"https://git.kernel.org/stable/c/6a2dbce5da2d2163a5b684acf68a0e54582ff0fa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8","name":"https://git.kernel.org/stable/c/080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/70ad543ce81f368411b6c721265a3b2d7ab4fda4","name":"https://git.kernel.org/stable/c/70ad543ce81f368411b6c721265a3b2d7ab4fda4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2332d35aaf206c17acf848522817252732596676","name":"https://git.kernel.org/stable/c/2332d35aaf206c17acf848522817252732596676","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74551","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74551","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 70ad543ce81f368411b6c721265a3b2d7ab4fda4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 2332d35aaf206c17acf848522817252732596676 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 6a2dbce5da2d2163a5b684acf68a0e54582ff0fa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.151 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.103 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc6 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hwmon/nzxt-smart2.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"70ad543ce81f368411b6c721265a3b2d7ab4fda4","status":"affected","version":"53e68c20aeb1e23419bed811aa3a309ceda200f9","versionType":"git"},{"lessThan":"51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f","status":"affected","version":"53e68c20aeb1e23419bed811aa3a309ceda200f9","versionType":"git"},{"lessThan":"2332d35aaf206c17acf848522817252732596676","status":"affected","version":"53e68c20aeb1e23419bed811aa3a309ceda200f9","versionType":"git"},{"lessThan":"6a2dbce5da2d2163a5b684acf68a0e54582ff0fa","status":"affected","version":"53e68c20aeb1e23419bed811aa3a309ceda200f9","versionType":"git"},{"lessThan":"080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8","status":"affected","version":"53e68c20aeb1e23419bed811aa3a309ceda200f9","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hwmon/nzxt-smart2.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.17"},{"lessThan":"5.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.151","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.103","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc6","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc6","versionStartIncluding":"5.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-08-15T12:27:58.237Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/70ad543ce81f368411b6c721265a3b2d7ab4fda4"},{"url":"https://git.kernel.org/stable/c/51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f"},{"url":"https://git.kernel.org/stable/c/2332d35aaf206c17acf848522817252732596676"},{"url":"https://git.kernel.org/stable/c/6a2dbce5da2d2163a5b684acf68a0e54582ff0fa"},{"url":"https://git.kernel.org/stable/c/080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8"}],"title":"hwmon: (nzxt-smart2) DMA-align output buffer","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74551","datePublished":"2026-08-15T12:27:58.237Z","dateReserved":"2026-08-15T05:44:03.915Z","dateUpdated":"2026-08-15T12:27:58.237Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:18:00","lastModifiedDate":"2026-08-15 13:18:00","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74551","Ordinal":"1","Title":"hwmon: (nzxt-smart2) DMA-align output buffer","CVE":"CVE-2026-74551","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74551","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"hwmon: (nzxt-smart2) DMA-align output buffer"}]}}}