Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only kernel UAF reachable by an authorized low-priv user (AV:L/PR:L), requiring a memory race (AC:H); successful elevation gives full kernel control (C:H/I:H/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 Storage allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows arises from a use-after-free flaw (CWE-416) in the Windows Storage component, affecting Windows 10 (1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2019/2022/2025. An authorized attacker who already has low-level access to a machine can trigger the freed-memory reuse to elevate to higher privileges (CVSS 7.0, high attack complexity). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already have valid local, authorized access to the target Windows system with at least low-level privileges (PR:L) and the ability to execute code that interacts with the Windows Storage subsystem; no user interaction is required (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H yields 7.0 (High): exploitation is local (AV:L), requires already holding some privileges (PR:L), needs no user interaction (UI:N), but carries High attack complexity (AC:H) - meaning the attacker must win a race or successfully groom kernel memory, which is not trivially reliable. … 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 foothold on a Windows host - for example via phishing, a compromised service account, or a limited RDP session - runs a crafted program that rapidly frees and reallocates Windows Storage objects to win the race and reuse freed kernel memory. On a successful attempt they corrupt kernel state to elevate to SYSTEM, enabling full host control; the high attack complexity means exploitation may require multiple attempts. … |
| Remediation | Apply the Microsoft security update for CVE-2026-58526 (Patch available per vendor advisory) via Windows Update or WSUS/SCCM/Intune, using the KB and fixed builds listed on the MSRC page at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58526; an exact fixed build number was not provided in the input, so consult the MSRC update guide for the precise KB per OS version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows 10 (versions 1809, 21H2, 22H2), Windows 11 (versions 24H2, 25H2, 26H1), and Windows Server (2019, 2022, 2025) to establish remediation scope. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43765
GHSA-h4ff-8jr3-p6jp