{"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":"2026-07-09T21:00:04.507068642Z","published":"2026-06-19T14:43:33.214Z","related":["CGA-gmgv-q3wp-f72g","SUSE-SU-2026:22521-1","SUSE-SU-2026:22522-1","SUSE-SU-2026:2799-1","SUSE-SU-2026:2800-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52909.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305"},{"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":"WEB","url":"https://git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3"},{"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":"12acc977838c943636fb01e2f3087d2e4cc3b7cc"},{"fixed":"7f28e3948c59481f8db9c9638e204258d26b4e41"},{"fixed":"12c65e2c7fef507551bd7b52123598a761662c01"},{"fixed":"f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3"},{"fixed":"c5dbd669db5a426b3025512322e1bf2cdbe14305"},{"fixed":"ecf8904067dcba0dad86ece80874841e60317885"},{"fixed":"dcdce3bc9f08026ff3739ee7339e1bef526fc5f3"},{"fixed":"d289d5307762d1838aaece22c6b6fcad9e8865f9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52909.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.15.0"},{"fixed":"5.10.260"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.211"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.177"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.144"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.95"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52909.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}