CVE-2026-43403: nsfs: tighten permission checks for ns iteration ioctls
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 mayseeallnamespaces() helper that centralizes this policy until the nstree adapts.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-43403?
The severity of CVE-2026-43403 is rated as high with a score of 8.8.
What systems are affected by CVE-2026-43403?
CVE-2026-43403 affects the Linux kernel.
How do I fix CVE-2026-43403?
To fix CVE-2026-43403, you should update your Linux kernel to the latest version that addresses this vulnerability.
What type of vulnerability is CVE-2026-43403?
CVE-2026-43403 is related to improper permission checks in the Linux kernel affecting namespace iteration ioctls.
What are the implications of CVE-2026-43403?
The implications of CVE-2026-43403 include potential information leaks between privileged services on the Linux platform.