EUVD-2026-43852
GHSA-hgwq-93c2-v862
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low existing privileges required for a kernel UAF (AV:L/PR:L), no user interaction, and full SYSTEM compromise gives C/I/A High.
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 allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel allows an already-authenticated attacker to gain SYSTEM-level control by exploiting a use-after-free (CWE-416) memory corruption condition. The flaw affects a broad range of supported Windows client and server releases (Windows 10 1809 through Windows 11 26H1, and Windows Server 2019 through 2025) and, per the CVSS 7.8 vector, yields full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated code-execution on the target host at low privilege (CVSS PR:L) - this is a second-stage privilege-escalation flaw, not an initial-access or remote vector (AV:L). … 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, 7.8 High) describes a low-complexity local attack requiring only low existing privileges and no user interaction, with high impact across all three security properties - a classic reliable privilege-escalation profile. … 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 host - for example via phishing, a compromised standard user account, or a foothold on a shared terminal server - runs a crafted program that triggers the kernel use-after-free, grooms the freed allocation, and reclaims it to corrupt kernel memory and elevate to SYSTEM. Given AV:L/AC:L, exploitation is local and low-complexity with no user interaction required, though it depends on the attacker having a working exploit; no public exploit identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-50329 as delivered through Windows Update / WSUS / the MSRC update guide; Patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50329 - consult that page for the exact patched KB build number matching each Windows 10/11 or Windows Server 2019/2022/2025 SKU, as the fixed build differs per release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (1809-26H1), Windows 11, and Windows Server 2019/2022/2025 systems to scope patch requirements. …
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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