CVE-2026-85825: Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
Use after free in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges locally.
Other sources
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
— 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 10.0.26100.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
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Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - 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 10.0.28000.3231Patch KB5127646 - Upgrade
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Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
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Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651
Event History
Frequently Asked Questions
Which systems should be prioritized for assessment?
Systems running the listed Microsoft Windows client or server products should be assessed, especially where lower-privileged authorized users can execute code locally. The affected product list includes Windows 10, Windows 11, Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025.
What level of access does an attacker need?
Exploitation requires local access and low privileges. The attacker must already be an authorized user on the target system; the provided information does not indicate remote exploitation.
What is the likely impact if exploitation succeeds?
A successful attack can elevate local privileges and affects confidentiality, integrity, and availability. This could allow a low-privileged user to gain higher-level control of the affected Windows system.