CVE-2026-49798: Windows Kernel Elevation of Privilege Vulnerability
Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges locally.
Other sources
Windows Kernel Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26226Patch KB5099445 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23291Patch KB5099444 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33158Patch KB5099536 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9339Patch KB5099535 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.8875Patch KB5101650 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.8875Patch KB5101650 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.2525Patch KB5101649 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19045.7548Patch KB5099539 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7548Patch KB5099539 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9020Patch KB5099538 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5386Patch KB5099540
Event History
Frequently Asked Questions
What is the severity of CVE-2026-49798?
CVE-2026-49798 has a critical severity score of 9.3.
What is CVE-2026-49798?
CVE-2026-49798 is a Windows Kernel Elevation of Privilege Vulnerability caused by a use after free error.
How do I fix CVE-2026-49798?
To fix CVE-2026-49798, apply the latest security updates provided by Microsoft for the affected Windows versions.
Which systems are affected by CVE-2026-49798?
CVE-2026-49798 affects Microsoft Windows 10, Windows 11, and several versions of Windows Server including 2012 R2, 2016, 2019, and 2022.
What are the potential impacts of CVE-2026-49798?
An attacker exploiting CVE-2026-49798 can elevate privileges locally, potentially allowing them to execute arbitrary code.