CVE-2025-39926 (GCVE-0-2025-39926)
Vulnerability from cvelistv5
Published
2025-10-01 08:07
Modified
2025-10-01 08:07
Severity ?
Summary
In 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e
Version: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e
Version: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e
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          "programFiles": [
            "net/netlink/genetlink.c"
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      "descriptions": [
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          "lang": "en",
          "value": "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."
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      "providerMetadata": {
        "dateUpdated": "2025-10-01T08:07:13.883Z",
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        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5"
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    "cveId": "CVE-2025-39926",
    "datePublished": "2025-10-01T08:07:13.883Z",
    "dateReserved": "2025-04-16T07:20:57.147Z",
    "dateUpdated": "2025-10-01T08:07:13.883Z",
    "state": "PUBLISHED"
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  }
}


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