{"cve":"CVE-2026-52909","nvd":{"published":"2026-06-19T15:16:35.383","modified":"2026-10-19T20:18:45.097","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-863"],"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"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-52909","score":0.00113,"percentile":0.01434,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}