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CVE-2026-57973Important

Windows Subsystem for Linux (WSL2) Kernel Tampering Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Important
CVSS base score
6.3CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
Impact
Tampering
EPSS, next 30 days
0.2%Higher than 10.9% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Windows Subsystem for Linux
Weakness
CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Issued by
Microsoft
Published
14 Jul 2026 · July 2026
Last revised
14 Jul 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Open Source Software
1 affected product
  • Windows Subsystem for Linux (WSL2)
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