CVE-2025-21994 (GCVE-0-2025-21994)
Vulnerability from cvelistv5
Published
2025-04-02 14:00
Modified
2025-05-04 07:27
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix incorrect validation for num_aces field of smb_acl parse_dcal() validate num_aces to allocate posix_ace_state_array. if (num_aces > ULONG_MAX / sizeof(struct smb_ace *)) It is an incorrect validation that we can create an array of size ULONG_MAX. smb_acl has ->size field to calculate actual number of aces in request buffer size. Use this to check invalid num_aces.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
Version: 0626e6641f6b467447c81dd7678a69c66f7746cf
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{
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/smbacl.c"
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          "versions": [
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              "version": "0",
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              "status": "unaffected",
              "version": "6.6.85",
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            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.21",
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            {
              "lessThanOrEqual": "6.13.*",
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              "version": "6.13.9",
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            {
              "lessThanOrEqual": "*",
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              "version": "6.14",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix incorrect validation for num_aces field of smb_acl\n\nparse_dcal() validate num_aces to allocate posix_ace_state_array.\n\nif (num_aces \u003e ULONG_MAX / sizeof(struct smb_ace *))\n\nIt is an incorrect validation that we can create an array of size ULONG_MAX.\nsmb_acl has -\u003esize field to calculate actual number of aces in request buffer\nsize. Use this to check invalid num_aces."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:27:00.353Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236"
        },
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          "url": "https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675"
        },
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        {
          "url": "https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64"
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      ],
      "title": "ksmbd: fix incorrect validation for num_aces field of smb_acl",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21994",
    "datePublished": "2025-04-02T14:00:37.407Z",
    "dateReserved": "2024-12-29T08:45:45.801Z",
    "dateUpdated": "2025-05-04T07:27:00.353Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21994\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-02T14:16:01.440\",\"lastModified\":\"2025-04-10T13:15:49.333\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: fix incorrect validation for num_aces field of smb_acl\\n\\nparse_dcal() validate num_aces to allocate posix_ace_state_array.\\n\\nif (num_aces \u003e ULONG_MAX / sizeof(struct smb_ace *))\\n\\nIt is an incorrect validation that we can create an array of size ULONG_MAX.\\nsmb_acl has -\u003esize field to calculate actual number of aces in request buffer\\nsize. Use this to check invalid num_aces.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: Se corrige la validaci\u00f3n incorrecta del campo num_aces de smb_acl. La funci\u00f3n parse_dcal() valida num_aces para asignar posix_ace_state_array. Si (num_aces \u0026gt; ULONG_MAX / sizeof(struct smb_ace *)), se considera una validaci\u00f3n incorrecta que permita crear una matriz de tama\u00f1o ULONG_MAX. smb_acl tiene el campo -\u0026gt;size para calcular el n\u00famero real de ases en el tama\u00f1o del b\u00fafer de solicitud. \u00daselo para comprobar num_aces no v\u00e1lidos.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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