EUVD-2026-44007
GHSA-6vcq-v59p-j58c
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged attacker (AV:L/PR:L) must win a non-deterministic race (AC:H) with no user interaction, yielding full SYSTEM compromise (C:H/I:H/A:H) within the unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Win32K kernel-mode subsystem allows an authenticated low-privileged user to win a race condition and elevate to SYSTEM across Windows 10, Windows 11 (through 26H1), and Windows Server 2012 through 2025. Reported by Microsoft with a patch available, it carries CVSS 7.0 but a high attack complexity (AC:H) reflecting the timing-sensitive nature of the flaw. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess valid low-privileged local credentials or code execution on the target (CVSS PR:L, AV:L) - this is a second-stage local escalation, not a remote entry point, and cannot be triggered over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals collectively point to a real but not urgent local escalation issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a foothold as a standard (non-admin) user - for example via phishing, a compromised service account, or an unprivileged shell on a shared terminal server - runs a program that rapidly and repeatedly triggers the vulnerable Win32K operation from multiple threads to win the timing window. On a successful race, kernel memory is corrupted to hijack a token or execute code at kernel level, granting SYSTEM privileges. … |
| Remediation | Apply the Microsoft security update for CVE-2026-54107 via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54107 (Patch available per vendor advisory); install the fixed cumulative build for your specific OS, for example 10.0.26100.8875 for Windows 11 24H2, 10.0.19045.7548 for Windows 10 22H2, 10.0.20348.5386 for Windows Server 2022, 10.0.17763.9020 for Windows 10 1809/Server 2019, 10.0.14393.9339 for 1607/Server 2016, 6.3.9600.23291 for Server 2012 R2, and 6.2.9200.26226 for Server 2012. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, perform an inventory audit of all Windows 10, Windows 11 (through 26H1), and Windows Server 2012-2025 systems to establish baseline patch status and identify critical assets. …
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External POC / Exploit Code
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