SB2026011380 - Multiple vulnerabilities in Microsoft Windows Virtualization-Based Security (VBS)

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Main Vulnerability Database SB2026011380

SB2026011380 - Multiple vulnerabilities in Microsoft Windows Virtualization-Based Security (VBS)

Published: January 13, 2026

Security Bulletin ID SB2026011380
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Untrusted Pointer Dereference (CVE-ID: CVE-2026-20819)

CWE-ID: CWE-822 - Untrusted Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to gain access to sensitive information on the system.

The vulnerability exists due to untrusted pointer dereference in Windows Virtualization-Based Security (VBS). A local user can disclose sensitive information on the target system.


2) Untrusted Pointer Dereference (CVE-ID: CVE-2026-20935)

CWE-ID: CWE-822 - Untrusted Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local attacker to gain access to sensitive information on the system.

The vulnerability exists due to untrusted pointer dereference in Windows Virtualization-Based Security (VBS). A local attacker can disclose sensitive information on the target system.


3) Untrusted Pointer Dereference (CVE-ID: CVE-2026-20938)

CWE-ID: CWE-822 - Untrusted Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to untrusted pointer dereference in Windows Virtualization-Based Security (VBS). A local user can gain elevated privileges on the target system.


4) Heap-based buffer overflow (CVE-ID: CVE-2026-20876)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to escalate privileges on the target system.

The vulnerability exists due to a boundary error in Windows Virtualization-Based Security (VBS) Enclave. A local administrator can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the target system.


Remediation

Install update from vendor's website.

References