high7.5
CVE-2026-20934
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate priv…
Impact
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows 10 1607 | before 10.0.14393.8783 |
| Microsoft | Windows 10 1809 | before 10.0.17763.8276 |
| Microsoft | Windows 10 21h2 | before 10.0.19044.6809 |
| Microsoft | Windows 10 22h2 | before 10.0.19045.6809 |
| Microsoft | Windows 11 23h2 | before 10.0.22631.6491 |
| Microsoft | Windows 11 24h2 | before 10.0.26100.7623 |
| Microsoft | Windows 11 25h2 | before 10.0.26200.7623 |
| Microsoft | Windows Server 2012 | All versions Version r2 |
| Microsoft | Windows Server 2016 | before 10.0.14393.8783 |
| Microsoft | Windows Server 2019 | before 10.0.17763.8276 |
| Microsoft | Windows Server 2022 | before 10.0.20348.4648 |
| Microsoft | Windows Server 2022 23h2 | before 10.0.25398.2092 |