net/packet: fix TOCTOU race on mmap’d vnet_hdr in tpacket_snd()_MS:CVE-2026-31700

{
    "lastseen": "2026-05-03T07:15:12",
    "description": "",
    "published": "2026-05-02T08:04:59",
    "modified": "2026-05-02T21:41:31",
    "type": "mscve",
    "title": "net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd()",
    "source": "",
    "references": "",
    "id": "MS:CVE-2026-31700",
    "bulletinFamily": "microsoft",
    "cwe": null,
    "cvelist": [
        "CVE-2026-31700"
    ],
    "sourceData": "",
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    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-31700",
    "category_name": "News",
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}