Use after free in Windows ALPC allows an authorized attacker to elevate privileges locally.
Fix
Microsoft's update · Critical
- KB5127648 — Windows 11 Version 26H2 · build 10.0.26300.9711 · restart required
- KB5126646 — Windows Server 2025, Windows Server 2025 (Server Core installation) · build 10.0.26100.33650 · restart required
- KB5127646 — Windows 11 Version 26H1, Windows 11 version 26H1 · build 10.0.28000.3231 · restart required
- KB5126651 — Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation) · build 10.0.17763.9376 · restart required
- KB5126657 — Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 · build 10.0.19044.7807 · restart required
- KB5126657 — Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 · build 10.0.19045.7807 · restart required
- KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
- KB5126653 — Windows 11 Version 23H2 · build 10.0.22631.7652 · restart required
- KB5127648 — Windows 11 Version 24H2 · build 10.0.26100.9711 · restart required
- KB5127648 — Windows 11 Version 25H2 · build 10.0.26200.9711 · restart required
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.
Vendor advisories in the News 1
- Microsoft October 2026 Security Updates: 1476 CVEs, 1 exploited, 96 critical Microsoft Security Update Guide · 2026-10-13
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 2
- StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:33
- First seenCVSS 7.0NVD modified 2026-10-13 21:19
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.