Description
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
Published: 2026-10-13
Score: 7 High
EPSS: < 1% Very Low
KEV: No
Impact: Privilege Escalation
Action: Apply Patch
AI Analysis

Impact

The vulnerability is a use‑after‑free flaw in the Windows kernel that allows an attacker with local access to gain elevated privileges. An authorized attacker could exploit the flaw to run code with higher rights, potentially compromising the confidentiality, integrity, and availability of the system. The weakness is classified as CWE‑416, indicating memory misuse through a freed object remaining in use.

Affected Systems

Affected products include Microsoft Windows 11 version 23H2 and Microsoft Windows Server 2025, including the Server Core installation. The vulnerability is present on both x64 and arm64 builds of Windows 11 23H2, as well as on all architectures of Windows Server 2025. Any environment running these operating systems without the vendor's patch may be vulnerable.

Risk and Exploitability

The CVSS score of 7 indicates a high severity, but the EPSS score is not available. The vulnerability is not listed in the CISA KEV catalog. The attack requires that the attacker have local code execution privileges, suggesting that a user with sufficient authority could trigger the flaw. The potential for privilege escalation makes the risk significant for organizations running the affected systems.

Generated by OpenCVE AI on October 17, 2026 at 00:44 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the security update issued by Microsoft for Windows 11 23H2 and Windows Server 2025
  • Reboot the system after applying the update to ensure the kernel changes take effect
  • Enable auditing to detect unauthorized privilege changes and monitor for signs of exploitation

Generated by OpenCVE AI on October 17, 2026 at 00:44 UTC.

Tracking

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Advisories

No advisories yet.

History

Fri, 23 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2025 (server Core Installation)

Thu, 22 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows 11 23h2
CPEs cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*
Vendors & Products Microsoft windows 11 23h2

Wed, 14 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
Title Windows Kernel Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 11 23h2
Microsoft windows Server 2025
Weaknesses CWE-416
CPEs cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 11 23h2
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 11 23h2 Windows 11 23h2 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-31T18:03:43.883Z

Reserved: 2026-08-03T23:54:57.811Z

Link: CVE-2026-70243

cve-icon Vulnrichment

Updated: 2026-10-13T20:50:02.011Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:19:41.120

Modified: 2026-10-22T12:20:35.203

Link: CVE-2026-70243

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T16:45:17Z

Weaknesses