CVE-2026-50349
highConcurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authoriz…
Vendor / product: Microsoft — windows 10 1607
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVSS
7.0
7.0 (CVSS v3.1)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (secure@microsoft.com)
Timeline (UTC)
Published: 2026-09-08 18:17
Modified: 2026-09-24 23:17
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 06:51 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
microsoft / windows_10_1607 <10.0.14393.9512
microsoft / windows_10_1809 <10.0.17763.9245
microsoft / windows_10_21h2 <10.0.19044.7725
microsoft / windows_10_22h2 <10.0.19045.7725
microsoft / windows_11_23h2 <10.0.22631.7582
microsoft / windows_11_24h2 <10.0.26100.9445
microsoft / windows_11_25h2 <10.0.26200.9445
microsoft / windows_11_26h1 <10.0.28000.2954
microsoft / windows_server_2012 all versions, r2
microsoft / windows_server_2016 <10.0.14393.9512
microsoft / windows_server_2019 <10.0.17763.9245
microsoft / windows_server_2022 <10.0.20348.5622
microsoft / windows_server_2025 <10.0.26100.33438
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50349
Patch / mitigation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50349
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50349 secure@microsoft.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:51 UTC · record ↗