hwmon: (nzxt-smart2) DMA-align output buffer

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74551
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:00 UTC
Updated2026-08-19 17:21:10 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001290000 probability, percentile 0.029420000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 81a6593b1c8dfb2694cd0ce39be01212d2b8436c git Not specified
CNA Linux Linux affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 70ad543ce81f368411b6c721265a3b2d7ab4fda4 git Not specified
CNA Linux Linux affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f git Not specified
CNA Linux Linux affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 2332d35aaf206c17acf848522817252732596676 git Not specified
CNA Linux Linux affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 6a2dbce5da2d2163a5b684acf68a0e54582ff0fa git Not specified
CNA Linux Linux affected 53e68c20aeb1e23419bed811aa3a309ceda200f9 080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 git Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/51a76bc1b8e717ee3fc0d84f15ac51490ca5f76f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a2dbce5da2d2163a5b684acf68a0e54582ff0fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/080bbf42faf77e6489ab30d5114c5f8f6ccbb1b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/81a6593b1c8dfb2694cd0ce39be01212d2b8436c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/70ad543ce81f368411b6c721265a3b2d7ab4fda4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2332d35aaf206c17acf848522817252732596676 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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