CVE-2026-64138: ksmbd: validate SID in parent security descriptor during ACL inheritance

Overview

Severity

Critical (CVSS 9.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-07-21

Last Updated

2026-08-13

EPSS Score

0.41% (percentile: 34.6%)

Affected Products (1)

Other

• 21580-17084

Revision History

• 2026-07-21: Information published.
• 2026-08-13: Information published.