CVE-2023-53369 (GCVE-0-2023-53369)
Vulnerability from cvelistv5
Published
2025-09-18 13:33
Modified
2025-09-18 13:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: dcb: choose correct policy to parse DCB_ATTR_BCN The dcbnl_bcn_setcfg uses erroneous policy to parse tb[DCB_ATTR_BCN], which is introduced in commit 859ee3c43812 ("DCB: Add support for DCB BCN"). Please see the comment in below code static int dcbnl_bcn_setcfg(...) { ... ret = nla_parse_nested_deprecated(..., dcbnl_pfc_up_nest, .. ) // !!! dcbnl_pfc_up_nest for attributes // DCB_PFC_UP_ATTR_0 to DCB_PFC_UP_ATTR_ALL in enum dcbnl_pfc_up_attrs ... for (i = DCB_BCN_ATTR_RP_0; i <= DCB_BCN_ATTR_RP_7; i++) { // !!! DCB_BCN_ATTR_RP_0 to DCB_BCN_ATTR_RP_7 in enum dcbnl_bcn_attrs ... value_byte = nla_get_u8(data[i]); ... } ... for (i = DCB_BCN_ATTR_BCNA_0; i <= DCB_BCN_ATTR_RI; i++) { // !!! DCB_BCN_ATTR_BCNA_0 to DCB_BCN_ATTR_RI in enum dcbnl_bcn_attrs ... value_int = nla_get_u32(data[i]); ... } ... } That is, the nla_parse_nested_deprecated uses dcbnl_pfc_up_nest attributes to parse nlattr defined in dcbnl_pfc_up_attrs. But the following access code fetch each nlattr as dcbnl_bcn_attrs attributes. By looking up the associated nla_policy for dcbnl_bcn_attrs. We can find the beginning part of these two policies are "same". static const struct nla_policy dcbnl_pfc_up_nest[...] = { [DCB_PFC_UP_ATTR_0] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_1] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_2] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_3] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_4] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_5] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_6] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_7] = {.type = NLA_U8}, [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG}, }; static const struct nla_policy dcbnl_bcn_nest[...] = { [DCB_BCN_ATTR_RP_0] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_1] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_2] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_3] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_4] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_5] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_6] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_7] = {.type = NLA_U8}, [DCB_BCN_ATTR_RP_ALL] = {.type = NLA_FLAG}, // from here is somewhat different [DCB_BCN_ATTR_BCNA_0] = {.type = NLA_U32}, ... [DCB_BCN_ATTR_ALL] = {.type = NLA_FLAG}, }; Therefore, the current code is buggy and this nla_parse_nested_deprecated could overflow the dcbnl_pfc_up_nest and use the adjacent nla_policy to parse attributes from DCB_BCN_ATTR_BCNA_0. Hence use the correct policy dcbnl_bcn_nest to parse the nested tb[DCB_ATTR_BCN] TLV.
Impacted products
Vendor Product Version
Linux Linux Version: 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e
Version: 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e
Version: 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e
Version: 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e
Version: 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e
Version: 859ee3c43812051e21816c6d6d4cc04fb7ce9b2e
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   Linux Linux Version: 2.6.29
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/dcb/dcbnl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/dcb/dcbnl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "2.6.29"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.190",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.126",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.253",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.190",
                  "versionStartIncluding": "2.6.29",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dcb: choose correct policy to parse DCB_ATTR_BCN\n\nThe dcbnl_bcn_setcfg uses erroneous policy to parse tb[DCB_ATTR_BCN],\nwhich is introduced in commit 859ee3c43812 (\"DCB: Add support for DCB\nBCN\"). Please see the comment in below code\n\nstatic int dcbnl_bcn_setcfg(...)\n{\n  ...\n  ret = nla_parse_nested_deprecated(..., dcbnl_pfc_up_nest, .. )\n  // !!! dcbnl_pfc_up_nest for attributes\n  //  DCB_PFC_UP_ATTR_0 to DCB_PFC_UP_ATTR_ALL in enum dcbnl_pfc_up_attrs\n  ...\n  for (i = DCB_BCN_ATTR_RP_0; i \u003c= DCB_BCN_ATTR_RP_7; i++) {\n  // !!! DCB_BCN_ATTR_RP_0 to DCB_BCN_ATTR_RP_7 in enum dcbnl_bcn_attrs\n    ...\n    value_byte = nla_get_u8(data[i]);\n    ...\n  }\n  ...\n  for (i = DCB_BCN_ATTR_BCNA_0; i \u003c= DCB_BCN_ATTR_RI; i++) {\n  // !!! DCB_BCN_ATTR_BCNA_0 to DCB_BCN_ATTR_RI in enum dcbnl_bcn_attrs\n  ...\n    value_int = nla_get_u32(data[i]);\n  ...\n  }\n  ...\n}\n\nThat is, the nla_parse_nested_deprecated uses dcbnl_pfc_up_nest\nattributes to parse nlattr defined in dcbnl_pfc_up_attrs. But the\nfollowing access code fetch each nlattr as dcbnl_bcn_attrs attributes.\nBy looking up the associated nla_policy for dcbnl_bcn_attrs. We can find\nthe beginning part of these two policies are \"same\".\n\nstatic const struct nla_policy dcbnl_pfc_up_nest[...] = {\n        [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},\n        [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},\n};\n\nstatic const struct nla_policy dcbnl_bcn_nest[...] = {\n        [DCB_BCN_ATTR_RP_0]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_1]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_2]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_3]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_4]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_5]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_6]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_7]         = {.type = NLA_U8},\n        [DCB_BCN_ATTR_RP_ALL]       = {.type = NLA_FLAG},\n        // from here is somewhat different\n        [DCB_BCN_ATTR_BCNA_0]       = {.type = NLA_U32},\n        ...\n        [DCB_BCN_ATTR_ALL]          = {.type = NLA_FLAG},\n};\n\nTherefore, the current code is buggy and this\nnla_parse_nested_deprecated could overflow the dcbnl_pfc_up_nest and use\nthe adjacent nla_policy to parse attributes from DCB_BCN_ATTR_BCNA_0.\n\nHence use the correct policy dcbnl_bcn_nest to parse the nested\ntb[DCB_ATTR_BCN] TLV."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-18T13:33:17.384Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5b3dbedb8d4a0f9f7ce904d76b885438af2a21f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e309f43d0ca4051d20736c06a6f84bbddd881da"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0da2684db18dead3bcee12fb185e596e3d63c2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecff20e193207b44fdbfe64d7de89890f0a7fe6c"
        },
        {
          "url": "https://git.kernel.org/stable/c/199fde04bd875d28b3a5ca525eaaa004eec6e947"
        },
        {
          "url": "https://git.kernel.org/stable/c/31d49ba033095f6e8158c60f69714a500922e0c3"
        }
      ],
      "title": "net: dcb: choose correct policy to parse DCB_ATTR_BCN",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53369",
    "datePublished": "2025-09-18T13:33:17.384Z",
    "dateReserved": "2025-09-17T14:54:09.734Z",
    "dateUpdated": "2025-09-18T13:33:17.384Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53369\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-18T14:15:39.373\",\"lastModified\":\"2025-09-19T16:00:27.847\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: dcb: choose correct policy to parse DCB_ATTR_BCN\\n\\nThe dcbnl_bcn_setcfg uses erroneous policy to parse tb[DCB_ATTR_BCN],\\nwhich is introduced in commit 859ee3c43812 (\\\"DCB: Add support for DCB\\nBCN\\\"). Please see the comment in below code\\n\\nstatic int dcbnl_bcn_setcfg(...)\\n{\\n  ...\\n  ret = nla_parse_nested_deprecated(..., dcbnl_pfc_up_nest, .. )\\n  // !!! dcbnl_pfc_up_nest for attributes\\n  //  DCB_PFC_UP_ATTR_0 to DCB_PFC_UP_ATTR_ALL in enum dcbnl_pfc_up_attrs\\n  ...\\n  for (i = DCB_BCN_ATTR_RP_0; i \u003c= DCB_BCN_ATTR_RP_7; i++) {\\n  // !!! DCB_BCN_ATTR_RP_0 to DCB_BCN_ATTR_RP_7 in enum dcbnl_bcn_attrs\\n    ...\\n    value_byte = nla_get_u8(data[i]);\\n    ...\\n  }\\n  ...\\n  for (i = DCB_BCN_ATTR_BCNA_0; i \u003c= DCB_BCN_ATTR_RI; i++) {\\n  // !!! DCB_BCN_ATTR_BCNA_0 to DCB_BCN_ATTR_RI in enum dcbnl_bcn_attrs\\n  ...\\n    value_int = nla_get_u32(data[i]);\\n  ...\\n  }\\n  ...\\n}\\n\\nThat is, the nla_parse_nested_deprecated uses dcbnl_pfc_up_nest\\nattributes to parse nlattr defined in dcbnl_pfc_up_attrs. But the\\nfollowing access code fetch each nlattr as dcbnl_bcn_attrs attributes.\\nBy looking up the associated nla_policy for dcbnl_bcn_attrs. We can find\\nthe beginning part of these two policies are \\\"same\\\".\\n\\nstatic const struct nla_policy dcbnl_pfc_up_nest[...] = {\\n        [DCB_PFC_UP_ATTR_0]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_1]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_2]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_3]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_4]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_5]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_6]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_7]   = {.type = NLA_U8},\\n        [DCB_PFC_UP_ATTR_ALL] = {.type = NLA_FLAG},\\n};\\n\\nstatic const struct nla_policy dcbnl_bcn_nest[...] = {\\n        [DCB_BCN_ATTR_RP_0]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_1]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_2]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_3]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_4]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_5]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_6]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_7]         = {.type = NLA_U8},\\n        [DCB_BCN_ATTR_RP_ALL]       = {.type = NLA_FLAG},\\n        // from here is somewhat different\\n        [DCB_BCN_ATTR_BCNA_0]       = {.type = NLA_U32},\\n        ...\\n        [DCB_BCN_ATTR_ALL]          = {.type = NLA_FLAG},\\n};\\n\\nTherefore, the current code is buggy and this\\nnla_parse_nested_deprecated could overflow the dcbnl_pfc_up_nest and use\\nthe adjacent nla_policy to parse attributes from DCB_BCN_ATTR_BCNA_0.\\n\\nHence use the correct policy dcbnl_bcn_nest to parse the nested\\ntb[DCB_ATTR_BCN] TLV.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/199fde04bd875d28b3a5ca525eaaa004eec6e947\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/31d49ba033095f6e8158c60f69714a500922e0c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b3dbedb8d4a0f9f7ce904d76b885438af2a21f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e309f43d0ca4051d20736c06a6f84bbddd881da\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0da2684db18dead3bcee12fb185e596e3d63c2b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecff20e193207b44fdbfe64d7de89890f0a7fe6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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