# CVE-2026-122113: Realtek RtUsbA64.sys stack exhaustion in USB descriptor parsing

Source: https://junglewise.ai/threats/cve-2026-122113-a-vulnerability-in-realtek-s-rtusba64-sys-usb-audio-driver  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-122113 · Severity: info · Published 2026-11-06

Realtek's USB audio driver for 64-bit Windows systems can be crashed by a maliciously crafted USB device, even without user login. An attacker with physical access could plug in such a device to trigger unbounded recursion and crash the entire system, denying users access to their computer.

Vendors: [Realtek](https://junglewise.ai/threats/vendors/realtek).

## Quick answers

**Is CVE-2026-122113 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-122113 being exploited in the wild.

**How severe is CVE-2026-122113?** Informational severity, published 6 November 2026.

**Which products and versions are affected?** Realtek RtUsbA64.sys.

**Is there a fix for CVE-2026-122113?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-122113 attacked?** It is attacked with physical access, in device firmware.

**Am I affected by CVE-2026-122113?** Check whether you run Realtek RtUsbA64.sys. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in RtUsbA64.sys's USB device topology-parsing logic, which fails to bound recursion depth when processing device descriptors during enumeration. A physically present attacker can craft a USB device with circular or deeply nested descriptors to exhaust the kernel stack, triggering a system bugcheck. The attack requires only physical access and no authentication.

## Affected products

- Realtek RtUsbA64.sys

## Timeline

- 2026-11-06: disclosed

## References

- [https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-122113](https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-122113)

## Related threats

- [Realtek RtUsbA64.sys IOCTL kernel write access](https://junglewise.ai/threats/cve-2026-90975-a-vulnerability-in-realtek-s-rtusba64-sys-usb-audio-driver-allows)