net: shaper: protect late read accesses to the hierarchy_CVE-2026-23437

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: shaper: protect late read accesses to the hierarchy\n\nWe look up a netdev during prep of Netlink ops (pre- callbacks)\nand take a ref to it. Then later in the body of the callback\nwe take its lock or RCU which are the actual protections.\n\nThis is not proper, a conversion from a ref to a locked netdev\nmust include a liveness check (a check if the netdev hasn't been\nunregistered already). Fix the read cases (those under RCU).\nWrites needs a separate change to protect from creating the\nhierarchy after flush has already run.",
    "published": "2026-04-03T15:15:22.048Z",
    "modified": "2026-04-27T14:02:24.149Z",
    "type": "cve",
    "title": "net: shaper: protect late read accesses to the hierarchy",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583\nhttps://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0\nhttps://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6",
    "id": "CVE-2026-23437",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb\nLinux Linux 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb\nLinux Linux 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb\nLinux Linux 6.13",
    "sourceHref": "",
    "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"
    },
    "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": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}