# CVE-2026-83879: Windows Overlay Filter race condition in shared resource synchronization

Source: https://junglewise.ai/threats/cve-2026-83879-concurrent-execution-using-shared-resource-with-improper  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-83879 · Severity: high · CVSS 7 · Published 2026-10-13

Windows Overlay Filter contains a race condition in how it manages shared system resources, allowing an authorized attacker to execute code with elevated privileges. An attacker with local access could exploit this timing flaw to gain administrative control over the system, potentially leading to full system compromise and access to sensitive data.

Technologies: [Microsoft Windows Overlay Filter](https://junglewise.ai/threats/technologies/windows-overlay-filter). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83879 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83879 being exploited in the wild.

**How severe is CVE-2026-83879?** High severity, with a CVSS score of 7, published 13 October 2026.

**Which products and versions are affected?** Microsoft Windows Overlay Filter.

**Is there a fix for CVE-2026-83879?** 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-2026-83879 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-83879?** Check whether you run Microsoft Windows Overlay Filter. 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

A race condition exists in Windows Overlay Filter's synchronization mechanism when multiple threads access shared resources concurrently. An authenticated local attacker can exploit this timing window to trigger an improper state transition, leading to privilege escalation. The vulnerability requires local access and authentication but does not require user interaction.

## Affected products

- Microsoft Windows Overlay Filter

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83879](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83879)

## Related threats

- [Windows Overlay Filter race condition privilege escalation](https://junglewise.ai/threats/cve-2026-121670-concurrent-execution-using-shared-resource-with-improper)
- [Microsoft Windows Overlay Filter race condition privilege escalation](https://junglewise.ai/threats/cve-2026-112813-concurrent-execution-using-shared-resource-with-improper)
- [Windows Overlay Filter integer overflow privilege escalation](https://junglewise.ai/threats/cve-2026-112760-integer-overflow-or-wraparound-in-windows-overlay-filter-allows)
- [Microsoft Windows Overlay Filter information disclosure](https://junglewise.ai/threats/cve-2026-108409-exposure-of-sensitive-system-information-to-an-unauthorized)
- [Windows Overlay Filter missing authorization](https://junglewise.ai/threats/cve-2026-96315-missing-authorization-in-windows-overlay-filter-allows-an)