High severity · published Oct 13, 2026
CVE-2026-70243
Windows Kernel Elevation of Privilege Vulnerability
7.0
CVSS
0.3%
EPSS
No
On KEV
Description
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 11 version 23H2 · Microsoft
10.0.22631.0 before 10.0.22631.7652; 10.0.22631.0 before 10.0.22631.7652 · source: vendor
WS
Windows Server 2025 · Microsoft
10.0.26100.0 before 10.0.26100.33650 · source: vendor, NVD
WS
Windows Server 2025 (Server Core installation) · Microsoft
10.0.26100.0 before 10.0.26100.33650 · source: vendor
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.7652; before 10.0.22631.7652 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-70243
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-70243
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70243
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