CVE-2026-52909

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.

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-25)

CWE

CWE-863

Published

2026-06-19

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7cc
• https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01
• https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41
• https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305
• https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9

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