CVE-2026-69906
Windows Secure Kernel Mode Elevation of Privilege Vulnerability
Description
Heap-based buffer overflow in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.
In plain language
AI Act nowCVE-2026-69906 is a Windows bug that can let someone with local access gain higher privileges; patching is important for most organizations because it targets core Windows security.
CVE-2026-69906 is a heap-based buffer overflow in Windows Secure Kernel Mode that can be triggered by an authorized local attacker to elevate privileges on affected Windows 10/11 and Windows Server versions; no public exploit is on record and it is not listed in CISA KEV.
What to do now
- Check your exact Windows version/build on each affected device (Settings → System → About, or run “winver”) and compare it to the fixed versions listed in the MS update guide.
- For Windows 10, update until you reach one of these fixed builds: 10.0.14393.9512, 10.0.17763.9245, 10.0.19044.7725, or 10.0.19045.7725.
- For Windows 11, update until you reach one of these fixed builds: 10.0.22631.7582, 10.0.26100.9445, 10.0.26200.9445, or 10.0.28000.2954.
- For Windows Server, update until you reach one of these fixed builds: Server 2016 (10.0.14393.9512), Server 2019 (10.0.17763.9245), Server 2022 (10.0.20348.5622), or Server 2025 (10.0.26100.33438).
- If you can’t patch right away, isolate systems with any untrusted local access (visitor laptops, temporary technician access, shared admin consoles) until updates are applied.
CVSS Vector Breakdown
AV:LAttack VectorAC:LAttack ComplexityPR:HPrivileges RequiredUI:NUser InteractionS:CScopeC:HConfidentialityI:HIntegrityA:HAvailabilityWeaknesses
Affected Products
Exploitability
Attack Graph
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
1 techniqueReferences
- Microsoft Patch Tuesday for September 2026 — Snort rules and prominent vulnerabilitiesen·Cisco Talos· Exploited Windows zero-day
- Microsoft and Adobe Patch Tuesday, September 2026 Security Update Reviewen-us·Qualys Security Blog· Exploited Microsoft Exchange Server Qualys
- Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-daysen-us·BleepingComputer· Exploited Windows patch-tuesday
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