PT-2026-32783 · Microsoft · Windows Tcp/Ip+1

Angelboy · Published 2026-04-14 · Updated 2026-04-17 · CVE-2026-27921

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 TCP/IP (affected versions not specified)

Description A race condition occurs in the Windows TCP/IP stack, specifically within the tdx.sys translation driver. This issue is a Time-of-Check to Time-of-Use (TOCTOU) flaw, where concurrent execution using a shared resource with improper synchronization allows an authorized attacker with local access to elevate privileges to the kernel level.

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

LPE

Race Condition

Use After Free

Weakness Enumeration

CWE-362

CWE-416

Related Identifiers

BDU:2026-05436

CVE-2026-27921

Affected Products

Windows

Windows Tcp/Ip

References · 7

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-27921 · Security Note
• https://bdu.fstec.ru/vul/2026-05436 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27921 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-27921 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27921 · Security Note
• https://twitter.com/CVEnew/status/2045112975825281399 · Twitter Post
• https://twitter.com/0dayPublishing/status/2044365046650679653 · Twitter Post