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
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. Rated CVSS 7.0 with full confidentiality, integrity, and availability impact once triggered.
Technical ContextAI
The vulnerability lives in the Windows MIDI Service, the operating-system component that brokers Musical Instrument Digital Interface (MIDI) device communication between user-mode applications and audio hardware/driver stacks. The root cause is a use-after-free (CWE-416): the service continues to reference a heap object after it has been freed, allowing an attacker who controls subsequent allocations to place controlled data at the dangling pointer's location and corrupt service memory. Because the MIDI service processes input from lower-privileged local callers while running with system access, corrupting its memory can redirect execution or manipulate privileged data structures. The affected CPEs are Microsoft Windows 11 version 24H2, 25H2, and 26H1; the tags also note a denial-of-service dimension consistent with memory corruption that can crash the service.
RemediationAI
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). Because this is a local privilege-escalation bug, prioritize deployment on multi-user and shared workstations and on any host where untrusted users can run code. Until the update is installed, compensating controls are limited but include restricting interactive/local logon to trusted users, enforcing least-privilege so fewer accounts can stage a local exploit, and monitoring for repeated crashes of the MIDI service (a likely side effect of failed use-after-free attempts); note that these controls reduce opportunity but do not remove the underlying flaw, and there is no documented supported way to disable the MIDI service as a workaround without breaking audio/MIDI functionality.
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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
Leaving vuln.today