GHSA-G852-MVXX-736R
Vulnerability from github – Published: 2025-04-08 09:31 – Updated: 2025-04-10 15:31In the Linux kernel, the following vulnerability has been resolved:
regulator: dummy: force synchronous probing
Sometimes I get a NULL pointer dereference at boot time in kobject_get() with the following call stack:
anatop_regulator_probe() devm_regulator_register() regulator_register() regulator_resolve_supply() kobject_get()
By placing some extra BUG_ON() statements I could verify that this is raised because probing of the 'dummy' regulator driver is not completed ('dummy_regulator_rdev' is still NULL).
In the JTAG debugger I can see that dummy_regulator_probe() and anatop_regulator_probe() can be run by different kernel threads (kworker/u4:*). I haven't further investigated whether this can be changed or if there are other possibilities to force synchronization between these two probe routines. On the other hand I don't expect much boot time penalty by probing the 'dummy' regulator synchronously.
{
"affected": [],
"aliases": [
"CVE-2025-22009"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-04-08T09:15:24Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nregulator: dummy: force synchronous probing\n\nSometimes I get a NULL pointer dereference at boot time in kobject_get()\nwith the following call stack:\n\nanatop_regulator_probe()\n devm_regulator_register()\n regulator_register()\n regulator_resolve_supply()\n kobject_get()\n\nBy placing some extra BUG_ON() statements I could verify that this is\nraised because probing of the \u0027dummy\u0027 regulator driver is not completed\n(\u0027dummy_regulator_rdev\u0027 is still NULL).\n\nIn the JTAG debugger I can see that dummy_regulator_probe() and\nanatop_regulator_probe() can be run by different kernel threads\n(kworker/u4:*). I haven\u0027t further investigated whether this can be\nchanged or if there are other possibilities to force synchronization\nbetween these two probe routines. On the other hand I don\u0027t expect much\nboot time penalty by probing the \u0027dummy\u0027 regulator synchronously.",
"id": "GHSA-g852-mvxx-736r",
"modified": "2025-04-10T15:31:48Z",
"published": "2025-04-08T09:31:12Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-22009"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5ade367b56c3947c990598df92395ce737bee872"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8619909b38eeebd3e60910158d7d68441fc954e9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d3b83a1442a09b145006eb4294b1a963c5345c9c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e26f24ca4fb940b15e092796c5993142a2558bd9"
}
],
"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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