PT-2026-2704 · Microsoft · Windows Kernel-Mode Driver+1

Published 2026-01-13 · Updated 2026-01-15 · CVE-2026-20859

Positive Technologies · (AI Summary)

CVSS v3.1

7.8

High

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Kernel-Mode Drivers (affected versions not specified)

Description A flaw exists in Windows Kernel-Mode Drivers that could allow a local attacker to gain higher privileges on a system. This issue involves a use-after-free condition. An authorized attacker can exploit this to elevate privileges locally.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2026-00502

CVE-2026-20859

Affected Products

Windows

Windows Kernel-Mode Driver

References · 9

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20859 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00502 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-20859 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20859 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20859 · Security Note
• https://osv.dev/vulnerability/CVE-2026-20859 · Vendor Advisory
• https://cybersecurity-help.cz/vulnerabilities/121454 · Note
• https://dbugs.ptsecurity.com/vulnerability/PT-2026-2704 · Note
• https://twitter.com/CVEnew/status/2011759667328807409 · Twitter Post