CVE-2026-43403 HIGH

CVE-2026-43403: nsfs: tighten permission checks for ns iteration ioctls

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 ns iteration ioctls 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