EUVD-2026-44085
GHSA-pfwp-6ww7-h9wr
Severity by source
AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Local kernel EoP realistically needs a standard-user foothold so PR:L; UAF race gives AC:H, UI:R per vendor, and successful exploitation yields full SYSTEM-level C/I/A.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/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 arises from a use-after-free (CWE-416) memory-corruption flaw that lets an attacker running code on the machine gain higher privileges, potentially SYSTEM. It affects a broad range of current Windows client and server builds (Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, Windows Server 2022/2025). …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the affected Windows host - the attacker must be able to execute code on the machine (AV:L), consistent with a standard-user or malware foothold seeking elevation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H, base 7.0) describes a local-only vulnerability with high attack complexity requiring user interaction, but full high confidentiality, integrity, and availability impact once triggered - a classic elevation-of-privilege profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user (or malware already running under a standard account) executes a crafted program that triggers the use-after-free in the Windows Kernel, wins the timing window to reclaim the freed object, and corrupts kernel memory to elevate to SYSTEM. Given AC:H and UI:R, the attacker likely needs a specific interaction or repeated attempts to hit the race reliably, and no public exploit is identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-50459 - Patch available per vendor advisory - via the standard cumulative update for each affected SKU; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50459 for the exact KB and fixed build for your Windows 10/11 or Windows Server version, as specific fixed version numbers are not enumerated in the provided data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, execute an inventory query to identify all instances of Windows 10 (21H2/22H2), Windows 11 (24H2/25H2/26H1), Windows Server 2022, and Windows Server 2025 in your environment. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 21H2
View allLocal privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local privilege escalation in the Windows Kernel lets an already-authenticated attacker corrupt kernel memory via a use-
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation in the Microsoft Windows Kernel allows an already-authenticated attacker to elevate to SYSTEM
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allShare
External POC / Exploit Code
Leaving vuln.today