{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "53e68c20aeb1e23419bed811aa3a309ceda200f9"
            },
            {
              "fixed": "81a6593b1c8dfb2694cd0ce39be01212d2b8436c"
            },
            {
              "fixed": "70ad543ce81f368411b6c721265a3b2d7ab4fda4"
            },
            {
              "fixed": "51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f"
            },
            {
              "fixed": "2332d35aaf206c17acf848522817252732596676"
            },
            {
              "fixed": "6a2dbce5da2d2163a5b684acf68a0e54582ff0fa"
            },
            {
              "fixed": "080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74551.json"
  },
  "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.",
  "id": "CVE-2026-74551",
  "modified": "2026-08-21T03:30:13.780219453Z",
  "published": "2026-08-15T12:27:58.237Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "hwmon: (nzxt-smart2) DMA-align output buffer"
}