EUVD-2026-43813
GHSA-m293-66rr-7hmg
Severity by source
AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Local privilege escalation presumes an existing low-privileged foothold (PR:L) and kernel UAF yields full ring-0 impact; scope kept Unchanged as the kernel is the same authority.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Kernel allows an unauthorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-level) privileges by triggering a use-after-free condition (CWE-416) in kernel memory. The flaw affects a broad range of supported Windows client and server releases, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local code execution on the affected Windows host: per the CVSS vector AV:L, the attacker must be able to run a program on the target (interactively, via RDP, or through an already-running low-privileged process), so this is a post-access privilege-escalation primitive, not a remote entry point. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high priority for patch prioritization, though not an emergency in the sense of confirmed mass exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host - for example via phishing, a malicious application, or a compromised standard user account - runs a crafted program that drives the vulnerable kernel code path to free an object and then reuse the dangling reference. By grooming kernel memory around the freed allocation, the attacker corrupts kernel structures to overwrite a security token or redirect execution, elevating from standard user to SYSTEM. … |
| Remediation | Apply the Microsoft security update for CVE-2026-49798 as the primary remediation; Patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49798, where Microsoft publishes the exact KB article and fixed build number for each affected Windows client and server SKU - deploy the corresponding cumulative update for your specific version and prioritize internet-facing and multi-user systems. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, establish an inventory of all Windows 10 (1607 and later), Windows 11, and Windows Server (2012 through 2025) systems and prioritize high-risk targets including servers and administrative workstations. …
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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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