CVE-2026-96939: Servicing Stack Updates Elevation of Privilege Vulnerability
Servicing Stack Updates Elevation of Privilege Vulnerability
Other sources
Time-of-check time-of-use (toctou) race condition in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7652Patch KB5126653
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
An attacker must already be authorized on the affected system and have local access. The issue is an elevation-of-privilege vulnerability, so it is relevant where lower-privileged local users or processes may be present.
Is remote exploitation indicated by the available severity data?
No. The supplied vector lists local attack vector (AV:L), indicating exploitation requires local access rather than network-based access.
What attacker interaction or access conditions are required?
The vector indicates low privileges are required (PR:L) and no user interaction is required (UI:N). Exploitation also has high attack complexity (AC:H), consistent with the race-condition nature of the issue.
Which systems should be assessed?
Assess Microsoft Windows 11 and Microsoft Windows Server 2025 systems that use Microsoft Servicing Stack Updates. The provided information does not identify specific affected update versions or patch identifiers.