EUVD-2026-73559
GHSA-8mh6-r595-qc25
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only kernel driver flaw requiring authenticated low-privileged access and high-complexity heap manipulation; full C/I/A reflects SYSTEM-level escalation with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Buffer over-read in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Win32K kernel graphics driver affects every supported Windows release from Server 2012 through Windows 11 26H1, allowing a low-privileged authenticated local user to gain SYSTEM-level access. The root cause is a buffer over-read (CWE-126) in the Win32K subsystem: out-of-bounds memory reads in kernel context can expose critical kernel data structures - including address layout information - that enable a subsequent control-flow hijack to full SYSTEM privileges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with at minimum low-privileged (standard user) access to the target Windows system, consistent with CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.0 with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H captures the realistic exploitation ceiling: local access and high attack complexity (AC:H) are hard requirements, meaning unauthenticated or remote exploitation is not possible and reliable triggering demands non-trivial heap-layout manipulation or race-condition timing. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released cumulative update that brings each installation to or above the fixed build: Windows 11 26H1 to 10.0.28000.2954, Windows 11 24H2 and 25H2 to 10.0.26100.9445 and 10.0.26200.9445 respectively, Windows 11 23H2 to 10.0.22631.7582, Windows 10 21H2 and 22H2 to 10.0.19044.7725 and 10.0.19045.7725 respectively, Windows 10 1607 and Server 2016 to 10.0.14393.9512, Server 2019 to 10.0.17763.9245, Server 2022 to 10.0.20348.5622, Server 2025 to 10.0.26100.33438, Server 2012 to 6.2.9200.26349, and Server 2012 R2 to 6.3.9600.23397. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems (Server 2012, 2016, 2019, 2022, Windows 10, Windows 11) in your environment and verify which are connected to your patch management systems. …
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Same weakness CWE-126 – Buffer Over-read
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External POC / Exploit Code
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