CVE-2022-22026: Windows Client Server Run-time Subsystem (CSRSS) Elevation of Privilege Vulnerability

Severity: high (CVSS 7.2 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-07-12 · updated 2026-06-17
Weakness: CWE-787

Description

Windows Client Server Run-time Subsystem (CSRSS) Elevation of Privilege Vulnerability

Affected products

Microsoft Windows 10 Version 1607: 20h2, 21h1, 21h2, 1607, 1809
Microsoft Windows 11 version 21H2: all versions
Microsoft Windows 7: all versions
Microsoft Windows 8.1: all versions
Microsoft Windows RT 8.1: all versions
Microsoft Windows Server 2008: r2-sp1
Microsoft Windows Server 2012: r2
Microsoft Windows Server 2016: 20h2
Microsoft Windows Server 2019: all versions
Microsoft Windows Server 2022: all versions
Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19360 — fixed in 10.0.10240.19360
Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.5246 — fixed in 10.0.14393.5246
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.3165 — fixed in 10.0.17763.3165
Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1826 — fixed in 10.0.19042.1826
Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1826 — fixed in 10.0.19043.1826
Microsoft Windows 10: from 10.0.19043.0 before 10.0.19044.1826 — fixed in 10.0.19044.1826
Microsoft Windows 11 21H2: from 10.0.0 before 10.0.22000.795 — fixed in 10.0.22000.795
Microsoft Windows 7: from 6.1.0 before 6.1.7601.26022 — fixed in 6.1.7601.26022
Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.26022 — fixed in 6.1.7601.26022
Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20478 — fixed in 6.3.9600.20478
Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0 before 6.1.7601.26022 — fixed in 6.1.7601.26022
Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0 before 6.0.6003.21569 — fixed in 6.0.6003.21569
Microsoft Windows Server 2012: from 6.2.9200.0 before 6.2.9200.23771 — fixed in 6.2.9200.23771
Microsoft Windows Server 2012 R2: from 6.3.9600.0 before 6.3.9600.20478 — fixed in 6.3.9600.20478
Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.5246 — fixed in 10.0.14393.5246
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.3165 — fixed in 10.0.17763.3165
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.825 — fixed in 10.0.20348.825
Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1826 — fixed in 10.0.19042.1826

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19360; Microsoft Windows 10 1607 10.0.14393.5246; Microsoft Windows 10 10.0.17763.3165; Microsoft Windows 10 20H2 10.0.19042.1826; Microsoft Windows 10 21H1 10.0.19043.1826; Microsoft Windows 10 10.0.19044.1826; Microsoft Windows 11 21H2 10.0.22000.795; Microsoft Windows 7 6.1.7601.26022; Microsoft Windows 7 Service Pack 1 6.1.7601.26022; Microsoft Windows 8.1 6.3.9600.20478; Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.26022; Microsoft Windows Server 2008 Service Pack 2 6.0.6003.21569. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2022-22026 or the next vulnerability affects your stack