GHSA-J8CP-H624-V86V

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-12-31 21:30
VLAI?
Details

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

phy: mdio: fix memory leak

Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic.

MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called

In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state

To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED before calling device_register(), because put_device() should be called even in case of device_register() failure.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2021-47416"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:27Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. Bus is only allocated\n\t2. Bus allocated and __mdiobus_register() fails, but\n\t   device_register() was called\n\nIn case of device_register() has been called we should call put_device()\nto correctly free the memory allocated for this device, but mdiobus_free()\ncalls just kfree(dev) in case of MDIOBUS_ALLOCATED state\n\nTo avoid this behaviour we need to set bus-\u003estate to MDIOBUS_UNREGISTERED\n_before_ calling device_register(), because put_device() should be\ncalled even in case of device_register() failure.",
  "id": "GHSA-j8cp-h624-v86v",
  "modified": "2024-12-31T21:30:44Z",
  "published": "2024-05-21T15:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47416"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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