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Critical severity · published Jun 9, 2026
CVE-2026-45657
Windows Kernel Remote Code Execution Vulnerability
9.8
CVSS
15.5%
EPSS
No
On KEV
Description
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)15.5% · higher than 97% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 11 Version 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.8655 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.8655 · source: vendor
W1
Windows 11 version 23H2 · Microsoft
10.0.22631.0 before 10.0.22631.7219; 10.0.22631.0 before 10.0.22631.7219 · source: vendor
W1
Windows 11 version 26H1 · Microsoft
10.0.28000.0 before 10.0.28000.2269 · source: vendor
WS
Windows Server 2022 · Microsoft
10.0.20348.0 before 10.0.20348.5256 · source: vendor, NVD
WS
Windows Server 2025 · Microsoft
10.0.26100.0 before 10.0.26100.32995 · source: vendor, NVD
WS
Windows Server 2025 (Server Core installation) · Microsoft
10.0.26100.0 before 10.0.26100.32995 · source: vendor
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.7219; before 10.0.22631.7219 · source: NVD
W1
Windows 11 24h2 · Microsoft
before 10.0.26100.8655; before 10.0.26100.8655 · source: NVD
W1
Windows 11 25h2 · Microsoft
before 10.0.26200.8655; before 10.0.26200.8655 · source: NVD
W1
Windows 11 26h1 · Microsoft
before 10.0.28000.2269; before 10.0.28000.2269 · source: NVD
Affected product
W1
Windows 11 version 23H2
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45657
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45657
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657
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