CVE-2026-52909
ip6_vti: set netns_immutable on the fallback device.
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.
INFO
Published Date :
June 19, 2026, 2:43 p.m.
Last Modified :
June 19, 2026, 2:43 p.m.
Remotely Exploit :
No
Source :
Linux
Affected Products
The following products are affected by CVE-2026-52909
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the latest Linux kernel security updates.
- Verify the netns_immutable flag is set on fallback devices.
- Test tunnel driver behavior after update.
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CVE-2026-52909 vulnerability anywhere in the article.