{"id":"CVE-2026-43451","state":"PUBLISHED","title":"netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_queue: fix entry leak in bridge verdict error path\n\nnfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue\nentry from the queue data structures, taking ownership of the entry.\nFor PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN\nattributes.  If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN\npresent but NFQA_VLAN_TCI missing), the function returns immediately\nwithout freeing the dequeued entry or its sk_buff.\n\nThis leaks the nf_queue_entry, its associated sk_buff, and all held\nreferences (net_device refcounts, struct net refcount).  Repeated\ntriggering exhausts kernel memory.\n\nFix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict\non the error path, consistent with other error handling in this file.","publishedAt":"2026-05-08T14:22:16.716Z","updatedAt":"2026-05-11T22:24:50.659Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"a907bea273b60d3e604ec4e8e1f6c49954805794","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"0b18d1b834ab5a5009be70b530f978d7989e445b","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"b38d2b4603fd3dda24eb8b3dd81c18a0930be97b","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"47b1c5d1b0944aa88299f55a846fabaefc756982","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"cf4a4df38d1747e06fc54f9879bd7a6f4178032f","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"9853d94b82d303fc4ac37d592a23a154096ecd41","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"208669df703a25a601f45822b10c413f258bf275","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"f1ba83755d81c6fc66ac7acd723d238f974091e9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nfnetlink_queue.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","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_queue.c"]}],"references":["https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794","https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b","https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b","https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982","https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f","https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41","https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275","https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43451.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43451","state":"PUBLISHED","datePublished":"2026-05-08T14:22:16.716Z","dateUpdated":"2026-05-11T22:24:50.659Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:56.010Z"},"containers":{"cna":{"title":"netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_queue: fix entry leak in bridge verdict error path\n\nnfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue\nentry from the queue data structures, taking ownership of the entry.\nFor PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN\nattributes.  If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN\npresent but NFQA_VLAN_TCI missing), the function returns immediately\nwithout freeing the dequeued entry or its sk_buff.\n\nThis leaks the nf_queue_entry, its associated sk_buff, and all held\nreferences (net_device refcounts, struct net refcount).  Repeated\ntriggering exhausts kernel memory.\n\nFix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict\non the error path, consistent with other error handling in this file."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"a907bea273b60d3e604ec4e8e1f6c49954805794","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"0b18d1b834ab5a5009be70b530f978d7989e445b","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"b38d2b4603fd3dda24eb8b3dd81c18a0930be97b","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"47b1c5d1b0944aa88299f55a846fabaefc756982","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"cf4a4df38d1747e06fc54f9879bd7a6f4178032f","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"9853d94b82d303fc4ac37d592a23a154096ecd41","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"208669df703a25a601f45822b10c413f258bf275","versionType":"git"},{"version":"8d45ff22f1b43249f0cf1baafe0262ca10d1666e","status":"affected","lessThan":"f1ba83755d81c6fc66ac7acd723d238f974091e9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nfnetlink_queue.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","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_queue.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794"},{"url":"https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b"},{"url":"https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b"},{"url":"https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982"},{"url":"https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f"},{"url":"https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41"},{"url":"https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275"},{"url":"https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:24:50.659Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}