What is CVE-2026-85879?

CVE-2026-85879 is a high-severity vulnerability in Microsoft Windows Subsystem For Linux (Wsl2), classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.0/10. Published 2026-10-13.

How severe is CVE-2026-85879?

High severity. CVSS v3 base score is 7.0 out of 10.

Vulnerability in Microsoft Windows Subsystem For Linux (Wsl2)

CVE-2026-85879

Time-of-check time-of-use (toctou) race condition in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Microsoft Windows Subsystem For Linux (Wsl2)

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

Windows Subsystem for Linux Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-85879?: CVE-2026-85879 is a high-severity vulnerability in Microsoft Windows Subsystem For Linux (Wsl2), classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.0/10. Published 2026-10-13.
How severe is CVE-2026-85879?: High severity. CVSS v3 base score is 7.0 out of 10.