ksmbd: validate owner of durable handle on reconnect_CVE-2026-31717

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate owner of durable handle on reconnect\n\nCurrently, ksmbd does not verify if the user attempting to reconnect\nto a durable handle is the same user who originally opened the file.\nThis allows any authenticated user to hijack an orphaned durable handle\nby predicting or brute-forcing the persistent ID.\n\nAccording to MS-SMB2, the server MUST verify that the SecurityContext\nof the reconnect request matches the SecurityContext associated with\nthe existing open.\nAdd a durable_owner structure to ksmbd_file to store the original opener's\nUID, GID, and account name. and catpure the owner information when a file\nhandle becomes orphaned. and implementing ksmbd_vfs_compare_durable_owner()\nto validate the identity of the requester during SMB2_CREATE (DHnC).",
    "published": "2026-05-01T13:56:12.012Z",
    "modified": "2026-05-03T05:45:37.776Z",
    "type": "cve",
    "title": "ksmbd: validate owner of durable handle on reconnect",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/00ce8d6789dae72d042a4522264964c72891ca37\nhttps://git.kernel.org/stable/c/c908c853f304a4969b5aa10eba0b50350cc65b80\nhttps://git.kernel.org/stable/c/49110a8ce654bbe56bef7c5e44cce31f4b102b8a",
    "id": "CVE-2026-31717",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux c8efcc786146a951091588e5fa7e3c754850cb3c\nLinux Linux c8efcc786146a951091588e5fa7e3c754850cb3c\nLinux Linux c8efcc786146a951091588e5fa7e3c754850cb3c\nLinux Linux 8df4bcdb0a4232192b2445256c39b787d58ef14d\nLinux Linux 6.9",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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": "c8efcc786146a951091588e5fa7e3c754850cb3c",
    "vendor": "Linux",
    "ai_description": "ksmbd vulnerability allowing authenticated users to hijack orphaned durable handles",
    "ai_severity": "High",
    "ai_vendor": "Linux",
    "ai_product": "ksmbd",
    "ai_version": "c8efcc786146a951091588e5fa7e3c754850cb3c",
    "ai_score": 8.8
}