GHSA-F9WM-PPG2-PC92
Vulnerability from github – Published: 2025-10-01 09:30 – Updated: 2025-12-11 18:30In the Linux kernel, the following vulnerability has been resolved:
genetlink: fix genl_bind() invoking bind() after -EPERM
Per family bind/unbind callbacks were introduced to allow families to track multicast group consumer presence, e.g. to start or stop producing events depending on listeners.
However, in genl_bind() the bind() callback was invoked even if capability checks failed and ret was set to -EPERM. This means that callbacks could run on behalf of unauthorized callers while the syscall still returned failure to user space.
Fix this by only invoking bind() after "if (ret) break;" check i.e. after permission checks have succeeded.
{
"affected": [],
"aliases": [
"CVE-2025-39926"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-01T08:15:35Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngenetlink: fix genl_bind() invoking bind() after -EPERM\n\nPer family bind/unbind callbacks were introduced to allow families\nto track multicast group consumer presence, e.g. to start or stop\nproducing events depending on listeners.\n\nHowever, in genl_bind() the bind() callback was invoked even if\ncapability checks failed and ret was set to -EPERM. This means that\ncallbacks could run on behalf of unauthorized callers while the\nsyscall still returned failure to user space.\n\nFix this by only invoking bind() after \"if (ret) break;\" check\ni.e. after permission checks have succeeded.",
"id": "GHSA-f9wm-ppg2-pc92",
"modified": "2025-12-11T18:30:35Z",
"published": "2025-10-01T09:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39926"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54"
}
],
"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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