Memory leak in Microsoft Windows and Windows Server - CVE-2026-108402

Vulnerability details

The vulnerability allows a remote attacker on the local network to cause a denial of service.

The vulnerability exists due to missing release of memory after its effective lifetime in the Windows Layer-2 Bridge Network Driver when handling network traffic. A remote attacker on the local network can trigger memory leaks through traffic from an adjacent network to exhaust memory resources and cause a denial of service.

Affected software

How to mitigate CVE-2026-108402

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-108402
• https://support.microsoft.com/help/5131085

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows