CVE-2026-74551hwmon: (nzxt-smart2) DMA-align output buffer
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 53e68c20aeb1e23419bed811aa3a309ceda200f9 before 81a6593b1c8dfb2694cd0ce39be01212d2b8436c; from 53e68c20aeb1e23419bed811aa3a309ceda200f9 before 70ad543ce81f368411b6c721265a3b2d7ab4fda4; 53e68c20aeb1e23419bed811aa3a309ceda200f9 builds before 51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f; from 53e68c20aeb1e23419bed811aa3a309ceda200f9 before 2332d35aaf206c17acf848522817252732596676; 53e68c20aeb1e23419bed811aa3a309ceda200f9 builds before 6a2dbce5da2d2163a5b684acf68a0e54582ff0fa; from 53e68c20aeb1e23419bed811aa3a309ceda200f9 before 080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 | CNA record |
References
- https://git.kernel.org/stable/c/81a6593b1c8dfb2694cd0ce39be01212d2b8436c
- https://git.kernel.org/stable/c/70ad543ce81f368411b6c721265a3b2d7ab4fda4
- https://git.kernel.org/stable/c/51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f
- https://git.kernel.org/stable/c/2332d35aaf206c17acf848522817252732596676
- https://git.kernel.org/stable/c/6a2dbce5da2d2163a5b684acf68a0e54582ff0fa
- https://git.kernel.org/stable/c/080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.