EUVD-2026-43769
GHSA-8mgw-7pfh-qv6c
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP needing an existing standard-user foothold gives AV:L/PR:L, no UI, low complexity, and kernel compromise yields full C/I/A impact with unchanged scope.
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
Use after free in Windows Kernel Mode Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Kernel Mode Driver affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025, where a use-after-free (CWE-416) lets an already-authenticated local attacker corrupt kernel memory and elevate to SYSTEM. Reported by Microsoft with a patch already available; 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 possess local, authenticated access and the ability to execute code as at least a standard user (CVSS PR:L), then invoke the vulnerable kernel-mode driver interface that mismanages the freed object. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8) describes a low-complexity local attack requiring low privileges and no user interaction, yielding full confidentiality, integrity, and availability impact - the classic profile of a privilege-escalation primitive rather than a remote entry point. … 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 or Server 2025 host - via a phishing payload, a compromised standard-user account, or a foothold from another bug - runs a crafted program that triggers the use-after-free in the kernel-mode driver, grooms the kernel heap to reclaim the freed object, and overwrites their process token to obtain SYSTEM. No public POC was provided in the input, but the low attack complexity means a reliable exploit is achievable once the UAF is understood. |
| Remediation | Apply the Microsoft security update for CVE-2026-58602 delivered through Windows Update / WSUS / the Microsoft Update Catalog for each affected platform (Patch available per vendor advisory); the exact fixed build numbers are enumerated at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58602 and should be applied to all Windows 11 24H2/25H2/26H1 and Windows Server 2025 (including Server Core) systems. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems to determine remediation scope and prioritize critical infrastructure. …
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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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