GHSA-WX96-HRFF-2RC8

Vulnerability from github – Published: 2026-07-24 18:31 – Updated: 2026-07-24 18:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

net: ethtool: phy: avoid NULL deref when PHY driver is unbound

phydev->drv can become NULL while the phy_device is still attached to its net_device, namely after the PHY driver is unbound via sysfs:

echo <mdio_id> > /sys/bus/mdio_bus/drivers/<phy_drv>/unbind

phy_remove() clears phydev->drv but doesn't call phy_detach(), so the phy_device stays in the link topology xarray and ethnl_req_get_phydev() still hands it back. ETHTOOL_MSG_PHY_GET then oopses on:

rep_data->drvname = kstrdup(phydev->drv->name, GFP_KERNEL);

drvname is already treated as optional by phy_reply_size(), phy_fill_reply() and phy_cleanup_data(), so just skip the allocation when there is no driver bound.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64228"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-24T16:16:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethtool: phy: avoid NULL deref when PHY driver is unbound\n\nphydev-\u003edrv can become NULL while the phy_device is still attached to\nits net_device, namely after the PHY driver is unbound via sysfs:\n\n\techo \u003cmdio_id\u003e \u003e /sys/bus/mdio_bus/drivers/\u003cphy_drv\u003e/unbind\n\nphy_remove() clears phydev-\u003edrv but doesn\u0027t call phy_detach(), so the\nphy_device stays in the link topology xarray and ethnl_req_get_phydev()\nstill hands it back. ETHTOOL_MSG_PHY_GET then oopses on:\n\n\trep_data-\u003edrvname = kstrdup(phydev-\u003edrv-\u003ename, GFP_KERNEL);\n\ndrvname is already treated as optional by phy_reply_size(),\nphy_fill_reply() and phy_cleanup_data(), so just skip the allocation\nwhen there is no driver bound.",
  "id": "GHSA-wx96-hrff-2rc8",
  "modified": "2026-07-24T18:31:27Z",
  "published": "2026-07-24T18:31:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64228"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17fe2381f967d353183f374a1c0181a6d194158c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3586924625559e6f9876d726c80ff0a75f0d5849"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3adf69f8eb121a9128c2b0029efd050d3649153"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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