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Vulnerability record · CVE-2022-29223 · published 24 May 2022

CVE-2022-29223: Eclipse threadx usbx classic buffer overflow vulnerability

Eclipse · Threadx Usbx

Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack. In versions prior to 6.1.10, an attacker can cause a buffer overflow by providing the Azure RTOS USBX host stack a HUB descriptor with `bNbPorts` set to a value greater than `UX_MAX_TT` which defaults to 8. For a `bNbPorts` value of 255, the implementation of `ux_host_class_hub_descriptor_get` function will modify the contents of `hub` -> `ux_host_class_hub_device` -> `ux_device_hub_tt` array violating the end boundary by 255 - `UX_MAX_TT` items. The USB host stack needs to validate the number of ports reported by the hub, and if the value is larger than UX_MAX_TT, USB stack needs to reject the request. This fix has been included in USBX release 6.1.10.

9.8 CVSS 3.1 Critical EPSS 1.2% · top 32.6% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score, v2 7.5
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack. In versions prior to 6.1.10, an attacker can cause a buffer overflow by providing the Azure RTOS USBX host stack a HUB descriptor with `bNbPorts` set to a value greater than `UX_MAX_TT` which defaults to 8. For a `bNbPorts` value of 255, the implementation of `ux_host_class_hub_descriptor_get` function will modify the contents of `hub` -> `ux_host_class_hub_device` -> `ux_device_hub_tt` array violating the end boundary by 255 - `UX_MAX_TT` items. The USB host stack needs to validate the number of ports reported by the hub, and if the value is larger than UX_MAX_TT, USB stack needs to reject the request. This fix has been included in USBX release 6.1.10.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/azure-rtos/usbx/releases/tag/v6.1.10_rel Release NotesThird Party Advisory
https://github.com/azure-rtos/usbx/security/advisories/GHSA-2qc5-385m-x862 Release NotesThird Party Advisory
https://github.com/azure-rtos/usbx/releases/tag/v6.1.10_rel Release NotesThird Party Advisory
https://github.com/azure-rtos/usbx/security/advisories/GHSA-2qc5-385m-x862 Release NotesThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2022-29223), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.