EUVD-2026-43836
GHSA-h5jv-76rr-555v
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Local low-privileged attacker exploits a kernel use-after-free with no user interaction (AV:L/PR:L/AC:L/UI:N); high integrity and availability impact, no confidentiality or scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 Windows Kernel lets an already-authenticated, low-privileged user corrupt kernel memory via a use-after-free (CWE-416) and gain higher privileges on the host. The flaw affects a broad range of currently-supported Windows client and server releases (Windows 10 1607 through Windows 11 26H1, and Windows Server 2016 through 2025); Microsoft has shipped a fix. …
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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 access to the target Windows system with at least low-level (standard user) privileges (CVSS PR:L, AV:L) and the ability to execute code locally; it cannot be triggered remotely or over a network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a moderate-priority local escalation rather than an emergency. … 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 through phishing, a compromised standard user account, or a malicious local application - runs code that triggers the kernel use-after-free to reallocate the freed object with attacker-controlled data. With AC:L and no user interaction required, they attempt to escalate from their standard user context toward SYSTEM, or at minimum crash the machine (denial of service). … |
| Remediation | Apply the Microsoft security update that addresses CVE-2026-50354 for each affected Windows edition; Patch available per vendor advisory - the input confirms a patch is available but does not specify an exact KB or build number, so consult the Microsoft update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50354 for the correct cumulative update per OS version and install it through Windows Update or WSUS/SCCM. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (versions 1607 through latest), Windows 11 (all versions through 26H1), and Windows Server (2016 through 2025) systems to determine organizational exposure. …
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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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