CVE-2026-83989: Windows Services for NFS ONCRPC XDR Driver Denial of Service Vulnerability
Out-of-bounds read in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to deny service over a network.
Other sources
Windows Services for NFS ONCRPC XDR Driver Denial of Service Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 10.0.26100.33438Patch KB5122871 - Upgrade
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Fixed in 6.2.9200.26349Patch KB5123065 - Upgrade
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Fixed in 6.3.9600.23397Patch KB5123066 - Upgrade
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Fixed in 10.0.14393.9512Patch KB5123099 - Upgrade
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Fixed in 10.0.28000.2954Patch KB5124012 - Upgrade
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Fixed in 10.0.26100.9445Patch KB5124008 - Upgrade
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Fixed in 10.0.22631.7582Patch KB5122880 - Upgrade
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Fixed in 10.0.19045.7725Patch KB5122878 - Upgrade
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Fixed in 10.0.26200.9445Patch KB5124008 - Upgrade
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Fixed in 10.0.19044.7725Patch KB5122878 - Upgrade
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Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
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Fixed in 10.0.17763.9245Patch KB5122876
Event History
Frequently Asked Questions
What access does an attacker need to trigger the denial of service?
The vulnerability is remotely exploitable over a network and requires no authentication or user interaction. An attacker can target an affected system without prior privileges.
What is the expected impact of successful exploitation?
Successful exploitation can deny service on the affected system. The provided impact information indicates availability impact only; it does not indicate confidentiality or integrity impact.
Which systems should be assessed for exposure?
Assess systems running Microsoft Windows 10, Windows 11, or Windows Server 2012, 2012 R2, 2016, 2019, 2022, or 2025, particularly where Windows Services for NFS and its ONCRPC XDR functionality are present and reachable over the network.