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Fencer Intel
medium 4.9

CVE-2026-96406 json

VIDEO class descriptor walk consumes device-controlled wTotalLength as its bound

published last mo. modified 22d ago also EUVD-2026-105002 , GHSA-8qf6-hjvf-g68f

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository eclipse-threadx/usbx. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits
0
none known

Summary

A VideoStreaming interface reports the size of its whole class-specific descriptor block in the `wTotalLength` field of its input header. The USBX host recorded that figure and used it as the budget for walking the format, frame and frame-interval descriptors, without holding it against the configuration descriptor actually received.

A device that reports a `wTotalLength` larger than the descriptors it supplies therefore had its own claim believed. Once the real bytes ran out the walk kept going, dereferencing the cursor past the end of the configuration buffer, in the host's context, whenever the application queried format or frame data.

Patch / fix

  • Eclipse Foundation Eclipse ThreadX - USBX 6.5.2.202603

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
22d ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 4.9 CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Affected products

  • Eclipse Foundation Eclipse ThreadX - USBX

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of eclipse-threadx/usbx published their own advisory on GitHub. Reviewed sources take precedence over it.