{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53369", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:54:09.734Z", "datePublished": "2025-09-18T13:33:17.384Z", "dateUpdated": "2026-05-11T19:43:36.996Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:43:36.996Z" }, "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 <= 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 <= 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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/dcb/dcbnl.c" ], "versions": [ { "version": "859ee3c43812051e21816c6d6d4cc04fb7ce9b2e", "lessThan": "5b3dbedb8d4a0f9f7ce904d76b885438af2a21f9", "status": "affected", "versionType": "git" }, { "version": "859ee3c43812051e21816c6d6d4cc04fb7ce9b2e", "lessThan": "8e309f43d0ca4051d20736c06a6f84bbddd881da", "status": "affected", "versionType": "git" }, { "version": "859ee3c43812051e21816c6d6d4cc04fb7ce9b2e", "lessThan": "a0da2684db18dead3bcee12fb185e596e3d63c2b", "status": "affected", "versionType": "git" }, { "version": "859ee3c43812051e21816c6d6d4cc04fb7ce9b2e", "lessThan": "ecff20e193207b44fdbfe64d7de89890f0a7fe6c", "status": "affected", "versionType": "git" }, { "version": "859ee3c43812051e21816c6d6d4cc04fb7ce9b2e", "lessThan": "199fde04bd875d28b3a5ca525eaaa004eec6e947", "status": "affected", "versionType": "git" }, { "version": "859ee3c43812051e21816c6d6d4cc04fb7ce9b2e", "lessThan": "31d49ba033095f6e8158c60f69714a500922e0c3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/dcb/dcbnl.c" ], "versions": [ { "version": "2.6.29", "status": "affected" }, { "version": "0", "lessThan": "2.6.29", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.253", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.190", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.126", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.45", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.10", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.4.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.10.190" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.15.126" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.1.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.4.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.5" } ] } ] } ], "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" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-53369", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:53:02.602085Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:03:02.451Z" } } ] } }