nsfs: tighten permission checks for handle opening_CVE-2026-43391

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnsfs: tighten permission checks for handle opening\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": "2026-05-08T14:21:36.012Z",
    "modified": "2026-05-11T06:34:07.262Z",
    "type": "cve",
    "title": "nsfs: tighten permission checks for handle opening",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/1797ee11451f1b2be69863a9f5bd43b948813fdf\nhttps://git.kernel.org/stable/c/d2324a9317f00013facb0ba00b00440e19d2af5e",
    "id": "CVE-2026-43391",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 5222470b2fbb3740f931f189db33dd1367b1ae75\nLinux Linux 5222470b2fbb3740f931f189db33dd1367b1ae75\nLinux Linux 6.18",
    "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": "5222470b2fbb3740f931f189db33dd1367b1ae75",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
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    "ai_version": "",
    "ai_score": 0
}