nsfs: tighten permission checks for ns iteration ioctls_CVE-2026-43403

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnsfs: tighten permission checks for ns iteration ioctls\n\nEven privileged services should not necessarily be able to see other\nprivileged service's namespaces so they can't leak information to each\nother. Use may_see_all_namespaces() helper that centralizes this policy\nuntil the nstree adapts.",
    "published": "2026-05-08T14:21:44.204Z",
    "modified": "2026-05-11T06:34:11.484Z",
    "type": "cve",
    "title": "nsfs: tighten permission checks for ns iteration ioctls",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38\nhttps://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4\nhttps://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9\nhttps://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148",
    "id": "CVE-2026-43403",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux a1d220d9dafa8d76ba60a784a1016c3134e6a1e8\nLinux Linux a1d220d9dafa8d76ba60a784a1016c3134e6a1e8\nLinux Linux a1d220d9dafa8d76ba60a784a1016c3134e6a1e8\nLinux Linux a1d220d9dafa8d76ba60a784a1016c3134e6a1e8\nLinux Linux 6.12",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "a1d220d9dafa8d76ba60a784a1016c3134e6a1e8",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}