EUVD-2026-73507
GHSA-p57p-j58m-7mpr
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low privilege required; AC:H reflects inherent TOCTOU race timing difficulty; full C/I/A post-escalation with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Time-of-check time-of-use (toctou) race condition in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Kernel across virtually all supported Windows releases exploits a time-of-check time-of-use (TOCTOU) race condition (CWE-367) to elevate from low-privilege user to SYSTEM. An authenticated local attacker wins a race between when the kernel validates a resource and when it uses it, substituting a different object between those two moments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated local session with at least low-privilege user rights on the target Windows system. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite a 7.0 CVSS base score and no active exploitation in CISA KEV, this vulnerability warrants serious prioritization: TOCTOU kernel LPEs are a primary post-exploitation stepping stone in ransomware and APT chains, where initial access typically arrives with limited privileges. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's cumulative update for the respective Windows version, targeting the build numbers listed under affected_products as the minimum patched baseline - for example, Windows Server 2025 should be updated to build 10.0.26100.33438 or later, and Windows 11 24H2 to 10.0.26100.9445 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems in your organization and confirm patch availability from Microsoft; while no public exploit has been identified at time of analysis, privilege escalation vulnerabilities are frequently exploited post-breach to deepen attacker access and establish persistence. …
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