CVE-2026-45657
Windows Kernel Remote Code Execution Vulnerability
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Kernel Remote Code Execution Vulnerability
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-45657- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-416, CWE-122
- Updated
- 2026-11-11
EUVDEUVD-2026-35697
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
- Record
EUVD-2026-35697- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-11
GitHub AdvisoriesGHSA-3r8r-9cjm-whj4
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
- Record
GHSA-3r8r-9cjm-whj4- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122
- Updated
- 2026-11-02
NVD
Use after free in Windows Kernel allows an unauthorized attacker to execute code over a network.
- Record
CVE-2026-45657- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-122, CWE-416
- Updated
- 2026-11-02
Affected products
- microsoft windows 11 version 23h2
- microsoft windows 11 version 24h2
- microsoft windows 11 version 25h2
- microsoft windows 11 version 26h1
- microsoft windows server 2022
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows 11 23h2
- microsoft windows 11 24h2
- microsoft windows 11 25h2
- microsoft windows 11 26h1
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | EUVD | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-45657 is a critical vulnerability (CVSS 9.8) in Microsoft Windows 11 Version 23h2, published June 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 15.5%, the 96th percentile. No source names a fixed version.