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CVE-2022-29223

Buffer overflow on HUB descriptor in Azure RTOS USBX

Published: May 24, 2022Updated: Oct 27, 2025 Sources: CVE List NVDCWE-120
NVD MITRE
7.5CVSSHIGH
EPSS Score
1.1%
Top 37.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-120

Affected Products

usbxazure-rtos
Embedded
Operating Systems / rtos-embedded-os
threadx usbxeclipseDevTools & CI
azure-rtoscommercialOperating Systemsaka usbx, netxduo, filex
eclipseoss-projectBEDevTools & CIaka eclipse-foundation

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

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

Timeline

Published
May 24, 2022
Last Updated
Oct 27, 2025

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