PT-2026-47879 · Microsoft · Windows

CVE-2026-42836 · Published 2026-06-09 · Updated 2026-06-10

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Windows (affected versions not specified)

Description A race condition occurs in the Function Discovery Service (fdwsd.dll) due to improper synchronization when using a shared resource. This allows an authorized attacker to elevate privileges locally to SYSTEM level.

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

DoS

Use After Free

Race Condition

Weakness Enumeration

CWE-416

CWE-362

Related Identifiers

BDU:2026-08165

CVE-2026-42836

Affected Products

Windows

References · 6

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42836 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-42836 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-08165 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-42836 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-42836 · Security Note
• https://twitter.com/windowsforum/status/2064528097739677914 · Twitter Post