EUVD-2026-56644
GHSA-fv2r-f2w7-vx86
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local low-privilege execution is the confirmed prerequisite; the read-only kernel disclosure produces high confidentiality loss with zero integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Windows Win32K allows an authorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in the Windows Win32K kernel graphics subsystem exposes kernel memory contents to a locally authenticated low-privilege attacker across a wide swath of Windows desktop and server releases, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. The impact is strictly information disclosure - high confidentiality loss with no integrity or availability effect - making this most practically useful as a KASLR-bypass building block in a multi-stage local privilege escalation chain. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local, low-privilege authenticated session on the target Windows system - any standard user account with the ability to invoke Win32K system calls (i.e., any interactive, RDP, or RunAs session) satisfies the prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 5.5 Medium with AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N accurately reflects the constrained threat model: local access, low complexity, low privilege, no user interaction, no scope change, and only confidentiality impact. … 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 Microsoft's vendor-released patches via Windows Update or WSUS targeting the following minimum fixed builds: Windows 10 1607 and Server 2016 → 10.0.14393.9418; Windows 10 1809 and Server 2019 → 10.0.17763.9115; Windows 10 21H2 → 10.0.19044.7663; Windows 10 22H2 → 10.0.19045.7663; Windows 11 23H2 → 10.0.22631.7517; Windows 11 24H2 and Server 2025 → 10.0.26100.9168 (desktop) / 10.0.26100.33296 (server); Windows 11 25H2 → 10.0.26200.9168; Windows 11 26H1 → 10.0.28000.2704; Server 2022 → 10.0.20348.5499; Server 2012 → 6.2.9200.26279; Server 2012 R2 → 6.3.9600.23337. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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