Quick answers
- Is CVE-2026-42916 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42916 being exploited in the wild.
- How severe is CVE-2026-42916?
- High severity, with a CVSS score of 7.8, published 9 June 2026.
- Which products and versions are affected?
- Microsoft Windows NT OS Kernel.
- Is there a fix for CVE-2026-42916?
- 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-2026-42916 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-42916?
- Check whether you run Microsoft Windows Nt. 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
An integer underflow (wraparound) vulnerability exists within the Windows NT OS Kernel. The flaw is triggered when the kernel incorrectly handles integer calculations, leading to memory corruption or logic errors. An attacker with low-privileged local access can exploit this vulnerability without any user interaction. Successful exploitation allows the attacker to escape their current security context and gain SYSTEM-level privileges. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows NT OS Kernel
Timeline
- 2026-06-09: disclosed
- 2026-06-09: advisory