Answer in brief
CVE-2026-74551 records a High severity (CVSS 7.8) vulnerability in hwmon: (nzxt-smart2) DMA-align output buffer. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <70ad543ce81f368411b6c721265a3b2d7ab4fda4 || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <2332d35aaf206c17acf848522817252732596676 || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <6a2dbce5da2d2163a5b684acf68a0e54582ff0fa || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 | 70ad543ce81f368411b6c721265a3b2d7ab4fda4, 51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f, 2332d35aaf206c17acf848522817252732596676, 6a2dbce5da2d2163a5b684acf68a0e54582ff0fa, 080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 |
| Linux/Linuxgeneric | 5.17 | Not reported |
| Linux/Linuxgeneric | >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <81a6593b1c8dfb2694cd0ce39be01212d2b8436c || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <70ad543ce81f368411b6c721265a3b2d7ab4fda4 || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <2332d35aaf206c17acf848522817252732596676 || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <6a2dbce5da2d2163a5b684acf68a0e54582ff0fa || >=53e68c20aeb1e23419bed811aa3a309ceda200f9 <080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 | 81a6593b1c8dfb2694cd0ce39be01212d2b8436c, 70ad543ce81f368411b6c721265a3b2d7ab4fda4, 51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f, 2332d35aaf206c17acf848522817252732596676, 6a2dbce5da2d2163a5b684acf68a0e54582ff0fa, 080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.