CVE-2026-64388: smb/client: fix chown/chgrp with SMB3 POSIX Extensions

Overview

Severity

Medium (CVSS 4.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-07-26

Last Updated

2026-08-11

EPSS Score

0.12% (percentile: 2.1%)

Affected Products (3)

Other

• 21580-17084
• 21626-17084
• 21684-17084

Revision History

• 2026-07-26: Information published.
• 2026-07-27: Information published.
• 2026-08-07: Information published.
• 2026-08-11: Information published.