EUVD-2026-43997
GHSA-vh8f-cgr8-9hm9
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-priv attacker (AV:L/PR:L) racing a use-after-free (AC:H) with no user interaction gains full host impact (C:H/I:H/A:H); scope unchanged per vendor modeling.
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 Hyper-V allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Hyper-V (CWE-416 use-after-free) allows an authenticated attacker already running low-privileged code on an affected host to elevate to higher privileges, with full confidentiality, integrity, and availability impact. Reported by Microsoft and affecting a broad range of Windows 10, Windows 11, and Windows Server builds including Server 2019/2022/2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the Hyper-V role/virtualization stack to be present and active on the target Windows host, and the attacker must already possess local, low-privileged execution on that host (PR:L, AV:L) - there is no network-facing or unauthenticated path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a real but non-trivial local elevation-of-privilege issue: the attacker must already have local, low-privilege access (PR:L) and must win a difficult condition (AC:H), which for a use-after-free typically means a race or precise heap-grooming/timing that is not reliably reproducible. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has gained an initial foothold as a low-privileged local user (for example via phishing or an already-compromised service account) runs code that repeatedly triggers the vulnerable Hyper-V code path, races to reallocate the freed kernel object with attacker-controlled data, and corrupts kernel memory to gain SYSTEM-level privileges on the host. Because AC:H requires winning a timing/heap-grooming condition, the attacker may need multiple attempts, and a failed attempt could crash the host (denial of service). … |
| Remediation | Apply the Microsoft security update for CVE-2026-54129 as the primary fix - patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54129; consult that page for the exact cumulative-update KB matching each Windows 10, Windows 11, or Windows Server build, as the input does not provide a single fixed version string. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all Windows systems running Hyper-V and identify affected builds across your infrastructure. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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