Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
Fix
Microsoft's update · Important
- KB5127646 — Windows 11 Version 26H1, Windows 11 version 26H1 · build 10.0.28000.3231 · restart required
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.
Patch, vendor advisory and mitigation references on NVD 1
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97803 Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 3
- Cpes+2 CPE criteria (now 2)NVD modified 2026-10-16 10:40
- StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-16 10:40
- First seenCVSS 7.8NVD modified 2026-10-13 23:19
Affected (CPE criteria) 2
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
References 1
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97803 Patch, Vendor Advisory