CVE-2025-40084 (GCVE-0-2025-40084)
Vulnerability from cvelistv5
Published
2025-10-29 13:37
Modified
2025-11-03 00:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: transport_ipc: validate payload size before reading handle handle_response() dereferences the payload as a 4-byte handle without verifying that the declared payload size is at least 4 bytes. A malformed or truncated message from ksmbd.mountd can lead to a 4-byte read past the declared payload size. Validate the size before dereferencing. This is a minimal fix to guard the initial handle read.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
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{
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          "programFiles": [
            "fs/smb/server/transport_ipc.c"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: transport_ipc: validate payload size before reading handle\n\nhandle_response() dereferences the payload as a 4-byte handle without\nverifying that the declared payload size is at least 4 bytes. A malformed\nor truncated message from ksmbd.mountd can lead to a 4-byte read past the\ndeclared payload size. Validate the size before dereferencing.\n\nThis is a minimal fix to guard the initial handle read."
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      "providerMetadata": {
        "dateUpdated": "2025-11-03T00:39:28.104Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "ksmbd: transport_ipc: validate payload size before reading handle",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40084",
    "datePublished": "2025-10-29T13:37:03.185Z",
    "dateReserved": "2025-04-16T07:20:57.161Z",
    "dateUpdated": "2025-11-03T00:39:28.104Z",
    "state": "PUBLISHED"
  },
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  }
}


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