CVE-2025-40355: sysfs: check visibility before changing group attribute ownership

Overview

Severity

Medium (CVSS 5.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2025-Dec

Released

2025-12-17

Last Updated

2026-03-31

EPSS Score

0.03% (percentile: 7.8%)

Affected Products (6)

Other

• 20823-17084
• 20956-17084
• 21094-17084
• 20788-17084
• 20860-17084

Open Source Software

• azl3 kernel 6.6.117.1-1 on Azure Linux 3.0

Revision History

• 2025-12-17: Information published.
• 2026-01-08: Information published.
• 2026-01-20: Information published.
• 2026-02-18: Information published.
• 2026-03-04: Information published.
• 2026-03-31: Information published.