NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg_CVE-2026-53026

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg\n\nIn nfsd4_add_rdaccess_to_wrdeleg, if fp->fi_fds[O_RDONLY] is already\nset by another thread, __nfs4_file_get_access should not be called\nto increment the nfs4_file access count since that was already done\nby the thread that added READ access to the file. The extra fi_access\ncount in nfs4_file can prevent the corresponding nfsd_file from being\nfreed.\n\nWhen stopping nfs-server service, these extra access counts trigger a\nBUG in kmem_cache_destroy() that shows nfsd_file object remaining on\n__kmem_cache_shutdown.\n\nThis problem can be reproduced by running the Git project's test\nsuite over NFS.",
    "published": "2026-06-24T16:29:34.855Z",
    "modified": "2026-06-28T06:38:15.626Z",
    "type": "cve",
    "title": "NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/4584229395d0d65bd517780afe97ffea07cb2c3d\nhttps://git.kernel.org/stable/c/b81572b073441dfd32213e41857676d0dbff4665\nhttps://git.kernel.org/stable/c/b48f44f36e6607b2f818560f19deb86b4a9c717b",
    "id": "CVE-2026-53026",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux c07dc84ed67c5a182273171639bacbbb87c12175\nLinux Linux 8072e34e1387d03102b788677d491e2bcceef6f5\nLinux Linux 8072e34e1387d03102b788677d491e2bcceef6f5\nLinux Linux 6.18.4\nLinux Linux 6.19",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "c07dc84ed67c5a182273171639bacbbb87c12175",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}