{"id":"CVE-2026-52909","summary":"ip6_vti: set netns_immutable on the fallback device.","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: set netns_immutable on the fallback device.\n\njohn1988 and Noam Rathaus reported that vti6_init_net() does not set the\nnetns_immutable flag on the per-netns fallback tunnel device (ip6_vti0).\n\nOther similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel)\ncorrectly set this flag during their fallback device initialization to\nprevent them from being moved to another network namespace.","modified":"2026-06-23T04:02:17.792514728Z","published":"2026-06-19T14:43:33.214Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52909.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52909.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52909"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"61220ab349485d911083d0b7990ccd3db6c63297"},{"fixed":"ecf8904067dcba0dad86ece80874841e60317885"},{"fixed":"dcdce3bc9f08026ff3739ee7339e1bef526fc5f3"},{"fixed":"d289d5307762d1838aaece22c6b6fcad9e8865f9"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-52909.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.15.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-52909.json"}}],"schema_version":"1.7.5"}