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CVE-2026-85858 is an out-of-bounds read vulnerability in the Windows Win32 Kernel Subsystem affecting Windows 11 version 23H2. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity with a CVSS score of 7.8. Microsoft has released an official fix for this issue.

This vulnerability (CVE-2026-85858) involves an out-of-bounds read in the Windows Win32 Kernel Subsystem in Windows 11 version 23H2. An authorized attacker with local access can exploit this flaw to elevate privileges. The CVSS 3.1 vector indicates the attack requires local access with high attack complexity and low privileges, no user interaction, and results in high impact to confidentiality, integrity, and availability. Microsoft has published an official fix addressing this vulnerability.

CVE-2026-85858 is an out-of-bounds read vulnerability in the Windows Win32 Kernel Subsystem affecting Windows 11 version 23H2. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity with a CVSS score of 7.8. Microsoft has released an official fix for this

CVE-2026-85858: CWE-125: Out-of-bounds Read in Microsoft Windows 11 version 23H2

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