1. Home
  2. CVE Database
  3. CVE-2026-42915
MEDIUM · 5.5

CVE-2026-42915

Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.

Vulnerability Description

Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows 10 21H2< 10.0.19044.7417
MicrosoftWindows 10 22H2< 10.0.19045.7417
MicrosoftWindows 11 23H2< 10.0.22631.7219
MicrosoftWindows 11 24H2< 10.0.26100.8655
MicrosoftWindows 11 25H2< 10.0.26200.8655
MicrosoftWindows 11 26H1< 10.0.28000.2269
MicrosoftWindows Server 2022< 10.0.20348.5256
MicrosoftWindows Server 2025< 10.0.26100.32995

Related Weaknesses (CWE)

CWE-131

References

FAQ

What is CVE-2026-42915?

CVE-2026-42915 is a vulnerability with a CVSS score of 5.5 (MEDIUM). Incorrect calculation of buffer size in Windows VMSwitch allows an authorized attacker to deny service locally.

How severe is CVE-2026-42915?

CVE-2026-42915 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42915?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 21H2, Microsoft Windows 10 22H2, Microsoft Windows 11 23H2, Microsoft Windows 11 24H2, Microsoft Windows 11 25H2.