EUVD-2026-44241
GHSA-69g4-9gmg-f5mg
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local, authenticated, non-interactive use-after-free requiring a race win gives AV:L/PR:L/AC:H; successful escalation yields full C/I/A impact within an unchanged scope.
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 flaw lets an already-authenticated local user elevate to higher privileges. Exploitation requires winning a race condition (high attack complexity), and Microsoft has released a fix; no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have a valid low-privileged local session on the target (CVSS PR:L, AV:L) and the ability to interact with the Windows MIDI Service Module 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 CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.0 High) describes a locally exploitable, low-privileged, no-user-interaction bug whose main barrier is high attack complexity - characteristic of a use-after-free that must win a memory-reuse race. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a normal (non-administrative) local account or code execution on a Windows 11 24H2/25H2/26H1 machine runs a crafted program that repeatedly drives the Windows MIDI Service to free and rapidly reallocate an object, racing to reuse the freed memory with attacker-controlled data. On a successful race the dangling pointer is dereferenced, corrupting privileged service memory and letting the attacker execute code or manipulate state at elevated privilege. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-56183 delivered through the normal Windows Update / monthly cumulative update channel for the affected Windows 11 24H2, 25H2, and 26H1 builds; obtain the exact patched build numbers from the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56183 (no specific fixed version string was included in the input data, so do not rely on an assumed number). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 devices running versions 24H2, 25H2, or 26H1 to prioritize remediation across your environment. …
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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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