GHSA-3M5X-223V-JQ2M
Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32In 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.
{
"affected": [],
"aliases": [
"CVE-2026-74551"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T13:18:00Z",
"severity": "HIGH"
},
"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": "GHSA-3m5x-223v-jq2m",
"modified": "2026-08-19T18:32:31Z",
"published": "2026-08-15T15:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74551"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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