CVE-2026-85879

Windows Subsystem for Linux Elevation of Privilege Vulnerability

Microsoft Windows Subsystem for Linux (WSL2)Operating systems

CVSS

7.0High

ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV

Exploit odds (EPSS)0.19%Chance of exploitation activity in the next 30 days, higher than 8% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed in2.7.10Fixed versionCVE List

Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

1 outlet mention it. Reports are not confirmation; each links to its source.

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

Text from CVE List