batman-adv: fix fragment reassembly length accounting_CVE-2026-52914

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: fix fragment reassembly length accounting\n\nbatman-adv keeps a running payload length for queued fragments and uses it\nto validate a fragment chain before reassembly.\n\nThat accounting currently allows the accumulated fragment length to be\ntruncated during updates. As a result, malformed fragment chains can\nbypass the intended validation and drive reassembly with inconsistent\nlength state, leading to a local denial of service.\n\nFix the accounting by storing the accumulated length in a length-typed\nfield and rejecting update overflows before the existing validation logic\nruns.\n\nThe fix was verified against the original reproducer and against valid\nfragment reassembly paths.",
    "published": "2026-06-24T07:14:11.906Z",
    "modified": "2026-06-28T06:36:31.785Z",
    "type": "cve",
    "title": "batman-adv: fix fragment reassembly length accounting",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64\nhttps://git.kernel.org/stable/c/37be61825b15534a16ff9cfc9546de155b6df982\nhttps://git.kernel.org/stable/c/975563c5de1123dde1ec7946bf5556d20c89d74e\nhttps://git.kernel.org/stable/c/f653b040dad1af70fa5cd4fe085e4758925480c9\nhttps://git.kernel.org/stable/c/e910dbf509125fe51ad68e4fa74dc8ab0a8e787a\nhttps://git.kernel.org/stable/c/3eb8bcb823391bd58997831b3c9c152a4ba8e255\nhttps://git.kernel.org/stable/c/fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0\nhttps://git.kernel.org/stable/c/9cd3f16c320bfdadd4509358122368deb56a5741",
    "id": "CVE-2026-52914",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605\nLinux Linux 3.13",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/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": {
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}