CVE-2026-64380: smb: client: harden POSIX SID length parsing

Overview

Severity

High (CVSS 8.2)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-07-26

Last Updated

2026-08-07

EPSS Score

0.44% (percentile: 37.4%)

Affected Products (1)

Other

• 21580-17084

Revision History

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