usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()

{
  "id": "aaff1c0239ce9ed439d027f627936d9f0b159611a94ae2caedb4a6d2041328d1",
  "url": "https://osv.dev/vulnerability/CVE-2026-72483",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control() The `max3421_hub_control()` function handles USB hub class requests to the virtual root hub. In the `default` branches of both the `ClearPortFeature` and `SetPortFeature` switch statements, it modifies `max3421_hcd->port_status` by left shifting 1 by the request's `value` parameter. However, it does not validate whether this shift will exceed the width of `port_status`. So if a malicious userspace task with access to the root hub via /dev/bus/usb/.../001 issues a USBDEVFS_CONTROL ioctl with `wValue` greater than or equal to 32, the left shift operation invokes shift-out-of-bounds undefined behavior. This results in arbitrary bit corruption of `port_status`, including the normally-immutable change bits, which can bypass internal state checks and confuse the hub status. Fix this by rejecting requests whose `value` exceeds the shift width before performing the shift. This issue was found using a KLEE-based symbolic execution tool for kernel drivers that I'm currently developing.",
    "evidence": "osv:CVE-2026-72483",
    "products": [
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          "value": "Kernel",
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    "severity": "high",
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:53.023392703Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30",
        "https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517",
        "https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54",
        "https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237",
        "https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5",
        "https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4",
        "https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4",
        "https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72483.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72483",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72483.json"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 521917,
  "published_at": "2026-08-15T05:57:20.914+00:00"
}