ip6_vti: set netns_immutable on the fallback device._CVE-2026-52909

{
    "lastseen": "",
    "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.",
    "published": "2026-06-19T14:43:33.214Z",
    "modified": "2026-06-28T06:36:26.193Z",
    "type": "cve",
    "title": "ip6_vti: set netns_immutable on the fallback device.",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885\nhttps://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3\nhttps://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9",
    "id": "CVE-2026-52909",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 61220ab349485d911083d0b7990ccd3db6c63297\nLinux Linux 61220ab349485d911083d0b7990ccd3db6c63297\nLinux Linux 61220ab349485d911083d0b7990ccd3db6c63297\nLinux Linux 3.15",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "61220ab349485d911083d0b7990ccd3db6c63297",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}