EUVD-2026-44244
GHSA-8fq3-vhhq-4r52
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only use-after-free needing an existing low-priv session (AV:L, PR:L) and a memory race to win (AC:H), yielding full local code execution (C/I/A:H, scope unchanged).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows MIDI Service Module affects Windows 11 versions 24H2, 25H2, and 26H1, where a use-after-free (CWE-416) memory corruption lets an already-authorized local user run code with elevated privileges. Microsoft rates it CVSS 7.0 and has released a patch; 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 authenticated local access with low privileges (CVSS PR:L, AV:L) on an affected Windows 11 24H2, 25H2, or 26H1 host, plus the ability to interact with the Windows MIDI Service Module to trigger and control reuse of the freed object. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a genuine but moderate, non-urgent risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged local session, for example via phishing, a stolen standard-user credential, or a foothold from another bug, triggers the use-after-free in the Windows MIDI Service Module by manipulating MIDI object allocation and free timing, then reuses the freed memory to execute attacker-controlled code at a higher privilege level. The high attack complexity means the attacker likely needs multiple attempts to win the underlying race; no public exploit code was identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-56187 to all affected Windows 11 24H2, 25H2, and 26H1 systems; Patch available per vendor advisory, so consult the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56187 for the exact KB and patched build for each branch, as no single fixed version string was provided in the input. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 systems running versions 24H2, 25H2, or 26H1 and prioritize those handling sensitive data or in critical roles. …
Sign in for detailed remediation steps and compensating controls.
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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