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Windows Winsock Race Condition Rated 7.0 CVSS

Last refreshed2026-10-30

Status: UPDATED  |  Advisory ID: CVE-2026-83738

Key Details

CVECVE-2026-83738
CVSS Score / Version
7.0 (High) / CVSS v3.1
Updated2026-10-29
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Prose
attack vector is local; attack complexity is high; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
see table below
Classified as
CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'))
Exploitation prediction (EPSS)
0.22% probability of exploitation in the next 30 days (12% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MicrosoftWindows 11 (version 23H2)
MicrosoftWindows 11 (version 24H2)
MicrosoftWindows 11 (version 25H2)
MicrosoftWindows 11 (version 26H1)
MicrosoftWindows Server 2025
MicrosoftWindows 10 (version 1607)
MicrosoftWindows 10 (version 1809)
MicrosoftWindows 10 (version 21H2)
MicrosoftWindows 10 (version 22H2)
MicrosoftWindows Server 2012
MicrosoftWindows Server 2016
MicrosoftWindows Server 2019
MicrosoftWindows Server 2022
MicrosoftWindows Server 2012 R2
MicrosoftWindows 11 Version 26H2
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

What to Do

Monitor Microsoft's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-83738
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-83738

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