{"id":"CVE-2026-43085","state":"PUBLISHED","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.","publishedAt":"2026-05-06T07:40:19.915Z","updatedAt":"2026-10-15T01:19:02.526Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"296f18e1c3a87c915a92ed27832d5040a22d1072","versionType":"git"},{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"9e2182865de781c41ab16b7985e9d26dcefea867","versionType":"git"},{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"57cc509d82b46150a11dcecc8b25eaa177eda34d","versionType":"git"},{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"368c22aea490f6f50df831b4f9e3623787686c5b","versionType":"git"},{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"d1399632ba255d2e02c757af5d9f5d9279ce168c","versionType":"git"},{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"d552bcfca323d175664d7444989b04f55666978a","versionType":"git"},{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"15d209bccf9273b4a8b4e579ba0e92d065b6ec8c","versionType":"git"},{"version":"29c5d4afba51c71cfeadd3f74f3c42e064483fb0","status":"affected","lessThan":"1f3083aec8836213da441270cdb1ab612dd82cf4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nfnetlink_log.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.23","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.23","versionType":"semver"},{"version":"5.10.258","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.136","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.83","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nfnetlink_log.c"]}],"references":["https://git.kernel.org/stable/c/296f18e1c3a87c915a92ed27832d5040a22d1072","https://git.kernel.org/stable/c/9e2182865de781c41ab16b7985e9d26dcefea867","https://git.kernel.org/stable/c/57cc509d82b46150a11dcecc8b25eaa177eda34d","https://git.kernel.org/stable/c/368c22aea490f6f50df831b4f9e3623787686c5b","https://git.kernel.org/stable/c/d1399632ba255d2e02c757af5d9f5d9279ce168c","https://git.kernel.org/stable/c/d552bcfca323d175664d7444989b04f55666978a","https://git.kernel.org/stable/c/15d209bccf9273b4a8b4e579ba0e92d065b6ec8c","https://git.kernel.org/stable/c/1f3083aec8836213da441270cdb1ab612dd82cf4","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43085.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43085","state":"PUBLISHED","datePublished":"2026-05-06T07:40:19.915Z","dateUpdated":"2026-10-15T01:19:02.526Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.983Z"},"containers":{"cna":{"title":"netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator","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. 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