ghsa-wgwx-65v3-j243
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
s390/pkey: Prevent overflow in size calculation for memdup_user()
Number of apqn target list entries contained in 'nr_apqns' variable is determined by userspace via an ioctl call so the result of the product in calculation of size passed to memdup_user() may overflow.
In this case the actual size of the allocated area and the value describing it won't be in sync leading to various types of unpredictable behaviour later.
Use a proper memdup_array_user() helper which returns an error if an overflow is detected. Note that it is different from when nr_apqns is initially zero - that case is considered valid and should be handled in subsequent pkey_handler implementations.
Found by Linux Verification Center (linuxtesting.org).
{
"affected": [],
"aliases": [
"CVE-2025-38257"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-09T11:15:27Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Prevent overflow in size calculation for memdup_user()\n\nNumber of apqn target list entries contained in \u0027nr_apqns\u0027 variable is\ndetermined by userspace via an ioctl call so the result of the product in\ncalculation of size passed to memdup_user() may overflow.\n\nIn this case the actual size of the allocated area and the value\ndescribing it won\u0027t be in sync leading to various types of unpredictable\nbehaviour later.\n\nUse a proper memdup_array_user() helper which returns an error if an\noverflow is detected. Note that it is different from when nr_apqns is\ninitially zero - that case is considered valid and should be handled in\nsubsequent pkey_handler implementations.\n\nFound by Linux Verification Center (linuxtesting.org).",
"id": "GHSA-wgwx-65v3-j243",
"modified": "2025-07-10T15:31:21Z",
"published": "2025-07-09T12:31:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38257"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
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