ip6_vti: set netns_immutable on the fallback device.

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Summary

CVECVE-2026-52909
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-19 15:16:35 UTC
Updated2026-06-19 15:16:35 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 ecf8904067dcba0dad86ece80874841e60317885 git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 d289d5307762d1838aaece22c6b6fcad9e8865f9 git Not specified
CNA Linux Linux affected 3.15 Not specified
CNA Linux Linux unaffected 3.15 semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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