CVE-2026-20870 — Use After Free in Microsoft Windows 11 Version 24h2

CWE-416 — Use After Free5 documents5 sources
Severity
7.8HIGHNVD
EPSS
0.0%
top 89.94%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
Microsoft Windows 11 Version 24h2Microsoft Windows 11 Version 25h2Microsoft Windows Server 2025+2 more
Timeline
PublishedJan 13

Description

Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages6 packages

▶NVDmicrosoft/windows< 10.0.26100.32230
▶NVDmicrosoft/windows_11_24h2< 10.0.26100.7623
▶NVDmicrosoft/windows_11_25h2< 10.0.26200.7623
▶CVEListV5microsoft/windows_server_202510.0.26100.0 — 10.0.26100.32230
▶CVEListV5microsoft/windows_11_version_24h210.0.26100.0 — 10.0.26100.7623

🔴Vulnerability Details

2
CVEList
Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability↗2026-01-13
▶
GHSA
GHSA-5m23-p78p-xgrg: Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally↗2026-01-13
▶

📋Vendor Advisories

1
Microsoft
Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability↗2026-01-13
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-20870 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-20870 — Use After Free in Microsoft | cvebase