PT-2026-7346 · Microsoft · Windows Subsystem For Linux+1

Chenjian · Published 2026-02-10 · Updated 2026-02-10 · CVE-2026-21242

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 Subsystem for Linux (affected versions not specified)

Description A use-after-free condition exists in Windows Subsystem for Linux that could allow a local attacker to gain elevated privileges. The issue allows attackers to affect the system.

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:2026-01779

CVE-2026-21242

Affected Products

Windows

Windows Subsystem For Linux

References · 6

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21242 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21242 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-21242 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21242 · Security Note
• https://bdu.fstec.ru/vul/2026-01779 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21242 · Vendor Advisory