CVE-2026-52909
Description
In the Linux kernel, the following vulnerability has been resolved: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace.
How to fix CVE-2026-52909
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/linux—no fix listed
Is CVE-2026-52909 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-52909.
Affected packages (1)
- from 0