# CVE-2026-90975: Realtek RtUsbA64.sys IOCTL kernel write access

Source: https://junglewise.ai/threats/cve-2026-90975-a-vulnerability-in-realtek-s-rtusba64-sys-usb-audio-driver-allows  
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-2026-90975 · Severity: info · Published 2026-11-06

A vulnerability in Realtek's USB audio driver (RtUsbA64.sys) allows a local attacker to exploit an improperly validated kernel interface, gaining unauthorized read and write access to kernel memory. An attacker with local access can escalate privileges and execute arbitrary code with kernel privileges, potentially taking complete control of the affected system.

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

## Quick answers

**Is CVE-2026-90975 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90975 being exploited in the wild.

**How severe is CVE-2026-90975?** Informational severity, published 6 November 2026.

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

**Is there a fix for CVE-2026-90975?** 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-2026-90975 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-90975?** 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 RtUsbA64.sys USB audio driver contains an unsafe IOCTL handler that processes caller-supplied user-mode pointers without proper validation or capture, allowing a local, low-privileged user to issue crafted property requests. This grants kernel-mode read and write access to memory, enabling local privilege escalation and arbitrary kernel code execution without authentication or special privileges.

## Affected products

- Realtek RtUsbA64.sys

## Timeline

- 2026-11-06: disclosed

## References

- [https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-90975](https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2026-90975)

## Related threats

- [Realtek RtUsbA64.sys stack exhaustion in USB descriptor parsing](https://junglewise.ai/threats/cve-2026-122113-a-vulnerability-in-realtek-s-rtusba64-sys-usb-audio-driver)