GHSA-WV6J-WRFJ-57WC

Vulnerability from github – Published: 2025-09-22 21:30 – Updated: 2025-09-22 21:30
VLAI?
Details

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

net: mdio: unexport __init-annotated mdio_bus_init()

EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic.

modpost used to detect it, but it has been broken for a decade.

Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds.

There are two ways to fix it:

  • Remove __init
  • Remove EXPORT_SYMBOL

I chose the latter for this case because the only in-tree call-site, drivers/net/phy/phy_device.c is never compiled as modular. (CONFIG_PHYLIB is boolean)

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-2022-49350"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:11Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mdio: unexport __init-annotated mdio_bus_init()\n\nEXPORT_SYMBOL and __init is a bad combination because the .init.text\nsection is freed up after the initialization. Hence, modules cannot\nuse symbols annotated __init. The access to a freed symbol may end up\nwith kernel panic.\n\nmodpost used to detect it, but it has been broken for a decade.\n\nRecently, I fixed modpost so it started to warn it again, then this\nshowed up in linux-next builds.\n\nThere are two ways to fix it:\n\n  - Remove __init\n  - Remove EXPORT_SYMBOL\n\nI chose the latter for this case because the only in-tree call-site,\ndrivers/net/phy/phy_device.c is never compiled as modular.\n(CONFIG_PHYLIB is boolean)",
  "id": "GHSA-wv6j-wrfj-57wc",
  "modified": "2025-09-22T21:30:17Z",
  "published": "2025-09-22T21:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49350"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35b42dce619701f1300fb8498dae82c9bb1f0263"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5534bcd7c40299862237c4a8fd9c5031b3db1538"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59fa94cddf9eef8d8dae587373eed8b8f4eb11d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a90a44d53428a3bf01bd80df9ba78b19959270c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7759c3222815b945a94b212bc0c6cdec475cfec2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab64ec2c75683f30ccde9eaaf0761002f901aa12"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2f0f8c18b60ca64ff50892ed899cf1c77864755"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5c68137f1191ba3fcf6260ec71b30be2e2bf4c3"
    }
  ],
  "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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