CVE-2026-89638: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions

Overview

Severity

High (CVSS 8.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Sep

Released

2026-09-13

Last Updated

2026-09-14

EPSS Score

0.17% (percentile: 6.7%)

Affected Products (1)

Other

• 21684-17084

Security Updates (1)

• Security Update

Revision History

• 2026-09-13: Information published.
• 2026-09-14: Information published.