hwmon: (nzxt-smart2) DMA-align output buffer

{
  "id": "5ab5a07f2df1712aadfb31ac03a7595ca43ced25498a9ea798c6f3f11742b2ec",
  "url": "https://osv.dev/vulnerability/CVE-2026-74551",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "hwmon: (nzxt-smart2) DMA-align output buffer",
    "summary": "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.",
    "evidence": "osv:CVE-2026-74551",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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        "affected_versions": []
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    "severity": "high",
    "structured": {
      "id": "CVE-2026-74551",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      ],
      "modified": "2026-10-28T02:30:52.914842053Z",
      "provider": "osv",
      "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",
        "https://git.kernel.org/stable/c/81a6593b1c8dfb2694cd0ce39be01212d2b8436c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74551.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74551",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74551.json"
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    "related_cves": [
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        "value": "CVE-2026-74551",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 521501,
  "published_at": "2026-08-15T12:27:58.237+00:00"
}