Answer in brief
CVE-2026-74551 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.
Answer in brief
CVE-2026-74551 records a Unknown severity 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). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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). 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 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 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.