erofs: fix the out-of-bounds nameoff handling for trailing dirents_CVE-2026-46078

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix the out-of-bounds nameoff handling for trailing dirents\n\nCurrently we already have boundary-checks for nameoffs, but the trailing\ndirents are special since the namelens are calculated with strnlen()\nwith unchecked nameoffs.\n\nIf a crafted EROFS has a trailing dirent with nameoff >= maxsize,\nmaxsize - nameoff can underflow, causing strnlen() to read past the\ndirectory block.\n\nnameoff0 should also be verified to be a multiple of\n`sizeof(struct erofs_dirent)` as well [1].\n\n[1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com",
    "published": "2026-05-27T12:58:11.916Z",
    "modified": "2026-05-30T10:47:18.879Z",
    "type": "cve",
    "title": "erofs: fix the out-of-bounds nameoff handling for trailing dirents",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789\nhttps://git.kernel.org/stable/c/48b27a955d22391c7f30169fa7b6b2e1977f1ce4\nhttps://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214\nhttps://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366\nhttps://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575",
    "id": "CVE-2026-46078",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 3aa8ec716e52c02360457fa018296629b4d0becf\nLinux Linux 3aa8ec716e52c02360457fa018296629b4d0becf\nLinux Linux 3aa8ec716e52c02360457fa018296629b4d0becf\nLinux Linux 3aa8ec716e52c02360457fa018296629b4d0becf\nLinux Linux 3aa8ec716e52c02360457fa018296629b4d0becf\nLinux Linux 4.19",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "3aa8ec716e52c02360457fa018296629b4d0becf",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}