{"api_version":"1","generated_at":"2026-05-13T17:20:11+00:00","cve":"CVE-2026-43085","urls":{"html":"https://cve.report/CVE-2026-43085","api":"https://cve.report/api/cve/CVE-2026-43085.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43085","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43085"},"summary":{"title":"netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator\n\nWhen batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send()\nappends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via\nnlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()\nhelper only zeroes alignment padding after the payload, not the payload\nitself, so four bytes of stale kernel heap data are leaked to userspace\nin the NLMSG_DONE message body.\n\nUse nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes\nthe nfgenmsg payload via nfnl_fill_hdr(), consistent with how\n__build_packet_message() already constructs NFULNL_MSG_PACKET headers.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-06 10:16:21","updated_at":"2026-05-06 13:08:07"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4","name":"https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c","name":"https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c","name":"https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b","name":"https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a","name":"https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43085","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43085","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 368c22aea490f6f50df831b4f9e3623787686c5b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 d1399632ba255d2e02c757af5d9f5d9279ce168c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 d552bcfca323d175664d7444989b04f55666978a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 15d209bccf9273b4a8b4e579ba0e92d065b6ec8c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 29c5d4afba51c71cfeadd3f74f3c42e064483fb0 1f3083aec8836213da441270cdb1ab612dd82cf4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.23","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.23 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.136 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.83 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.24 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.14 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nfnetlink_log.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"368c22aea490f6f50df831b4f9e3623787686c5b","status":"affected","version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","versionType":"git"},{"lessThan":"d1399632ba255d2e02c757af5d9f5d9279ce168c","status":"affected","version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","versionType":"git"},{"lessThan":"d552bcfca323d175664d7444989b04f55666978a","status":"affected","version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","versionType":"git"},{"lessThan":"15d209bccf9273b4a8b4e579ba0e92d065b6ec8c","status":"affected","version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","versionType":"git"},{"lessThan":"1f3083aec8836213da441270cdb1ab612dd82cf4","status":"affected","version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nfnetlink_log.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.23"},{"lessThan":"2.6.23","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.136","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.83","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.24","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.14","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.136","versionStartIncluding":"2.6.23","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.83","versionStartIncluding":"2.6.23","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.24","versionStartIncluding":"2.6.23","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.14","versionStartIncluding":"2.6.23","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.23","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator\n\nWhen batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send()\nappends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via\nnlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()\nhelper only zeroes alignment padding after the payload, not the payload\nitself, so four bytes of stale kernel heap data are leaked to userspace\nin the NLMSG_DONE message body.\n\nUse nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes\nthe nfgenmsg payload via nfnl_fill_hdr(), consistent with how\n__build_packet_message() already constructs NFULNL_MSG_PACKET headers."}],"providerMetadata":{"dateUpdated":"2026-05-06T07:40:19.915Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b"},{"url":"https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c"},{"url":"https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a"},{"url":"https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c"},{"url":"https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4"}],"title":"netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43085","datePublished":"2026-05-06T07:40:19.915Z","dateReserved":"2026-05-01T14:12:55.983Z","dateUpdated":"2026-05-06T07:40:19.915Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-06 10:16:21","lastModifiedDate":"2026-05-06 13:08:07","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43085","Ordinal":"1","Title":"netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE term","CVE":"CVE-2026-43085","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43085","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator\n\nWhen batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send()\nappends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via\nnlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put()\nhelper only zeroes alignment padding after the payload, not the payload\nitself, so four bytes of stale kernel heap data are leaked to userspace\nin the NLMSG_DONE message body.\n\nUse nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes\nthe nfgenmsg payload via nfnl_fill_hdr(), consistent with how\n__build_packet_message() already constructs NFULNL_MSG_PACKET headers.","Type":"Description","Title":"netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE term"}]}}}