EUVD-2026-43870
GHSA-wxv7-999p-7wx2
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated low-privileged user (AV:L/PR:L) races a privileged default-running service with no interaction (UI:N), gaining full SYSTEM control (C:H/I:H/A:H); AC:L per vendor though races are often probabilistic.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Audio Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Audio Service (Windows 11 versions 24H2, 25H2, and 26H1) lets an authenticated low-privileged user win a race condition to elevate to SYSTEM-level privileges. The flaw is a concurrent-access synchronization defect (CWE-362) reported by Microsoft with a CVSS 3.1 base score of 7.8; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access as a low-privileged user (CVSS PR:L, AV:L) and the ability to run code that interacts with the Windows Audio Service on Windows 11 version 24H2, 25H2, or 26H1; no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are internally consistent for a locally exploitable elevation-of-privilege issue: the CVSS vector is AV:L/AC:L/PR:L/UI:N (local access, low complexity, low privilege, no user interaction) with S:U and C:H/I:H/A:H, meaning an attacker who already has a foothold as a normal user can gain full confidentiality, integrity, and availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows 11 machine - for example via phishing, a malicious app, or a compromised standard user account - runs a local tool that repeatedly triggers concurrent audio-endpoint operations to win the synchronization race in the Audio Service. On a successful attempt the service mishandles the shared resource and the attacker gains SYSTEM-level privileges, enabling full host compromise. … |
| Remediation | Apply the Microsoft security update for your Windows 11 build as the primary fix - Patch available per vendor advisory; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50440 for the exact KB article and build number corresponding to version 24H2, 25H2, or 26H1, then deploy via Windows Update, WSUS, or Intune. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit your Windows 11 fleet to identify systems running versions 24H2, 25H2, or 26H1 and catalog the count of affected endpoints; enable process monitoring for Audio Service (AudioSrv.exe) anomalies. …
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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