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GHSA-8XG4-JW8Q-MM7V

Vulnerability from github – Published: 2025-10-01 12:30 – Updated: 2026-01-23 03:30
VLAI
Details

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

kobject: Add sanity check for kset->kobj.ktype in kset_register()

When I register a kset in the following way: static struct kset my_kset; kobject_set_name(&my_kset.kobj, "my_kset"); ret = kset_register(&my_kset);

A null pointer dereference exception is occurred: [ 4453.568337] Unable to handle kernel NULL pointer dereference at \ virtual address 0000000000000028 ... ... [ 4453.810361] Call trace: [ 4453.813062] kobject_get_ownership+0xc/0x34 [ 4453.817493] kobject_add_internal+0x98/0x274 [ 4453.822005] kset_register+0x5c/0xb4 [ 4453.825820] my_kobj_init+0x44/0x1000 [my_kset] ... ...

Because I didn't initialize my_kset.kobj.ktype.

According to the description in Documentation/core-api/kobject.rst: - A ktype is the type of object that embeds a kobject. Every structure that embeds a kobject needs a corresponding ktype.

So add sanity check to make sure kset->kobj.ktype is not NULL.

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-2023-53480"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T12:15:50Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkobject: Add sanity check for kset-\u003ekobj.ktype in kset_register()\n\nWhen I register a kset in the following way:\n\tstatic struct kset my_kset;\n\tkobject_set_name(\u0026my_kset.kobj, \"my_kset\");\n        ret = kset_register(\u0026my_kset);\n\nA null pointer dereference exception is occurred:\n[ 4453.568337] Unable to handle kernel NULL pointer dereference at \\\nvirtual address 0000000000000028\n... ...\n[ 4453.810361] Call trace:\n[ 4453.813062]  kobject_get_ownership+0xc/0x34\n[ 4453.817493]  kobject_add_internal+0x98/0x274\n[ 4453.822005]  kset_register+0x5c/0xb4\n[ 4453.825820]  my_kobj_init+0x44/0x1000 [my_kset]\n... ...\n\nBecause I didn\u0027t initialize my_kset.kobj.ktype.\n\nAccording to the description in Documentation/core-api/kobject.rst:\n - A ktype is the type of object that embeds a kobject.  Every structure\n   that embeds a kobject needs a corresponding ktype.\n\nSo add sanity check to make sure kset-\u003ekobj.ktype is not NULL.",
  "id": "GHSA-8xg4-jw8q-mm7v",
  "modified": "2026-01-23T03:30:29Z",
  "published": "2025-10-01T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53480"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/039ec9db2d30032eafa365f5f89b30eca5322b05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1792eac72e27f676bf9ebde28a5afea627fb85f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a772881bc059c596d8ca587cbd2a233edce3d3b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/48aebbe801e78a8932404c122ed0e880ccedc220"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d0fe8c52bb3029d83e323c961221156ab98680b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5df5829158513134ddcaf2184d9286eda7b0bb18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/964e025ceefdf75da46b0133d0c2790de451aeec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f3f6bf22a4f5ba649cf26ae4670de5c7f861bdef"
    }
  ],
  "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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