CVE-2026-43391 HIGH

CVE-2026-43391: nsfs: tighten permission checks for handle opening

Vendor Linux
Product Linux
Published May 8, 2026
Last update May 11, 2026

CVSS base score

8.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

In the Linux kernel, the following vulnerability has been resolved: nsfs: tighten permission checks for handle opening Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't leak information to each other. Use may_see_all_namespaces() helper that centralizes this policy until the nstree adapts.

Key dates

02Disclosure timeline

May 8, 2026 CVE published
May 11, 2026 Record updated