EUVD-2026-56332
GHSA-qmhr-hxjr-6m62
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only race condition requiring low-privileged account (PR:L) with high timing complexity (AC:H); full kernel-level CIA impact, scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Bind Filter Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Bind Filter Driver (bindflt.sys) permits a low-privileged local attacker to gain SYSTEM-level access on Windows 11 and Windows Server 2025 by exploiting a race condition that triggers a use-after-free in kernel memory. Affected builds span Windows 11 24H2, 25H2, and 26H1, as well as Windows Server 2025 including Server Core installations; Microsoft has released patched builds via the MSRC update guide. No public exploit code or confirmed active exploitation has been identified at time of analysis.
Technical ContextAI
The Windows Bind Filter Driver (bindflt.sys) is a kernel-mode driver that provides directory virtualization and bind mount functionality used by Windows containers and application isolation features. CWE-362 (Concurrent Execution Using Shared Resource with Improper Synchronization) describes a race condition where two or more threads compete over a shared kernel object; in this case the race results in a use-after-free condition - a freed memory region is accessed before it can be safely reclaimed, enabling an attacker to control the dangling pointer. Because execution occurs in kernel mode, successful exploitation yields the highest system privilege level. Affected CPE targets include Windows 11 versions 24H2 (10.0.26100.x), 25H2 (10.0.26200.x), and 26H1 (10.0.28000.x), as well as Windows Server 2025 (10.0.26100.x) in both full and Server Core configurations.
RemediationAI
Apply the vendor-released patch via Windows Update or the Microsoft Update Catalog, targeting the following minimum fixed builds: Windows 11 24H2 and 25H2 - build 10.0.26100.9168 or 10.0.26200.9168 respectively; Windows 11 26H1 - build 10.0.28000.2704; Windows Server 2025 (full and Server Core) - build 10.0.26100.33296. The full advisory and patch download links are available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61927. Where patching is immediately infeasible, restrict interactive local logon rights to trusted administrators only, enforce application control policies (e.g., AppLocker or WDAC) to prevent untrusted binaries from running, and monitor for unusual kernel driver interactions. Note that disabling bindflt.sys entirely may break Windows container and sandbox features that depend on bind filtering. No workaround fully substitutes for the patch given the kernel-mode attack surface.
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Same weakness CWE-362 – Race Condition
View allSame technique Denial Of Service
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External POC / Exploit Code
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