Memory leak in Microsoft Windows and Windows Server - CVE-2026-119955

Vulnerability details

The vulnerability allows a local privileged user to cause a denial of service.

The vulnerability exists due to failure to release memory after its effective lifetime in Windows Hyper-V when managing memory resources. A local privileged user can trigger the accumulation of unreleased memory to exhaust available resources and cause a denial of service.

Affected software

How to mitigate CVE-2026-119955

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-119955
• https://support.microsoft.com/help/5131090

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows