SB20260714111 - Multiple vulnerabilities in Microsoft Windows Secure Kernel Mode

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Validation of Consistency within Input (CVE-ID: CVE-2026-42982)

CWE-ID: CWE-1288 - Improper Validation of Consistency within Input

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 improper validation of consistency within input in Windows Secure Kernel Mode , which leads to security restrictions bypass and privilege escalation.

2) Use-after-free (CVE-ID: CVE-2026-50392)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/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 compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Windows Secure Kernel Mode. A local user can win a race condition and gain elevated privileges on the target system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42982
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50392