Quick answers
- Is CVE-2026-108403 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-108403 being exploited in the wild.
- How severe is CVE-2026-108403?
- High severity, with a CVSS score of 7.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Windows Kernel.
- Is there a fix for CVE-2026-108403?
- 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-2026-108403 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-108403?
- Check whether you run Microsoft Windows Kernel. 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 use-after-free vulnerability exists in the Windows Kernel that permits an authenticated local attacker to elevate privileges. The flaw allows memory that has been freed to be accessed, potentially leading to arbitrary code execution with kernel-level privileges. Exploitation requires local access and authorization to execute code on the system.
Affected products
- Microsoft Windows Kernel
Timeline
- 2026-11-10: disclosed