{"api_version":"1","generated_at":"2026-08-22T21:53:01+00:00","cve":"CVE-2026-74696","urls":{"html":"https://cve.report/CVE-2026-74696","api":"https://cve.report/api/cve/CVE-2026-74696.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74696","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74696"},"summary":{"title":"tcp: fix TFO max_qlen accounting across reuseport migration","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TFO max_qlen accounting across reuseport migration\n\nA listener's TCP_FASTOPEN max_qlen stops being accurate and lets through\nfar more pending Fast Open requests than it was configured for.\n\nThis only shows up with SO_REUSEPORT listener migration, where closing a\nlistener hands its still-pending TFO children over to a surviving one.\n\nfastopenq.qlen is charged in tcp_fastopen_create_child() when the child\nis created and uncharged in reqsk_fastopen_remove() when the handshake\ncompletes.  The uncharge follows rsk_listener of the request the child\npoints at, and inet_reqsk_clone() has repointed the child at a new\nrequest owned by the new listener, so the ++ and the -- land on two\ndifferent sockets.  The new listener's qlen drifts negative and its\nlimit no longer binds.\n\nCharge the new listener during migration, like reqsk_queue_migrated()\nalready does for queue->young and queue->qlen.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:44","updated_at":"2026-08-22 16:16:44"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b6247e0f96bd825ffb2005257f6177b5e642dee6","name":"https://git.kernel.org/stable/c/b6247e0f96bd825ffb2005257f6177b5e642dee6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/585fc5247d14939a561056aa2addd9b7c2b1f670","name":"https://git.kernel.org/stable/c/585fc5247d14939a561056aa2addd9b7c2b1f670","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e98f0d80b9cccb5f828425d2004f9686e7d1ae24","name":"https://git.kernel.org/stable/c/e98f0d80b9cccb5f828425d2004f9686e7d1ae24","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6e10ee56524a26b250229ad348637825646ddb88","name":"https://git.kernel.org/stable/c/6e10ee56524a26b250229ad348637825646ddb88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a0ab2ba83e35159d81cec830a92e885ecf8139be","name":"https://git.kernel.org/stable/c/a0ab2ba83e35159d81cec830a92e885ecf8139be","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d974618b2097453778389d385e3741629c40e0a3","name":"https://git.kernel.org/stable/c/d974618b2097453778389d385e3741629c40e0a3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a66e869cf0c90c1e47ae75f72b6482acbfc808ff","name":"https://git.kernel.org/stable/c/a66e869cf0c90c1e47ae75f72b6482acbfc808ff","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74696","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74696","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 54b92e84193749c9968aff2dd46e3b0f42643e18 e98f0d80b9cccb5f828425d2004f9686e7d1ae24 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 54b92e84193749c9968aff2dd46e3b0f42643e18 b6247e0f96bd825ffb2005257f6177b5e642dee6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 54b92e84193749c9968aff2dd46e3b0f42643e18 585fc5247d14939a561056aa2addd9b7c2b1f670 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 54b92e84193749c9968aff2dd46e3b0f42643e18 6e10ee56524a26b250229ad348637825646ddb88 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 54b92e84193749c9968aff2dd46e3b0f42643e18 a66e869cf0c90c1e47ae75f72b6482acbfc808ff git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 54b92e84193749c9968aff2dd46e3b0f42643e18 d974618b2097453778389d385e3741629c40e0a3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 54b92e84193749c9968aff2dd46e3b0f42643e18 a0ab2ba83e35159d81cec830a92e885ecf8139be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * 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/ipv4/inet_connection_sock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e98f0d80b9cccb5f828425d2004f9686e7d1ae24","status":"affected","version":"54b92e84193749c9968aff2dd46e3b0f42643e18","versionType":"git"},{"lessThan":"b6247e0f96bd825ffb2005257f6177b5e642dee6","status":"affected","version":"54b92e84193749c9968aff2dd46e3b0f42643e18","versionType":"git"},{"lessThan":"585fc5247d14939a561056aa2addd9b7c2b1f670","status":"affected","version":"54b92e84193749c9968aff2dd46e3b0f42643e18","versionType":"git"},{"lessThan":"6e10ee56524a26b250229ad348637825646ddb88","status":"affected","version":"54b92e84193749c9968aff2dd46e3b0f42643e18","versionType":"git"},{"lessThan":"a66e869cf0c90c1e47ae75f72b6482acbfc808ff","status":"affected","version":"54b92e84193749c9968aff2dd46e3b0f42643e18","versionType":"git"},{"lessThan":"d974618b2097453778389d385e3741629c40e0a3","status":"affected","version":"54b92e84193749c9968aff2dd46e3b0f42643e18","versionType":"git"},{"lessThan":"a0ab2ba83e35159d81cec830a92e885ecf8139be","status":"affected","version":"54b92e84193749c9968aff2dd46e3b0f42643e18","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/inet_connection_sock.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.14"},{"lessThan":"5.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.216","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.152","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.216","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TFO max_qlen accounting across reuseport migration\n\nA listener's TCP_FASTOPEN max_qlen stops being accurate and lets through\nfar more pending Fast Open requests than it was configured for.\n\nThis only shows up with SO_REUSEPORT listener migration, where closing a\nlistener hands its still-pending TFO children over to a surviving one.\n\nfastopenq.qlen is charged in tcp_fastopen_create_child() when the child\nis created and uncharged in reqsk_fastopen_remove() when the handshake\ncompletes.  The uncharge follows rsk_listener of the request the child\npoints at, and inet_reqsk_clone() has repointed the child at a new\nrequest owned by the new listener, so the ++ and the -- land on two\ndifferent sockets.  The new listener's qlen drifts negative and its\nlimit no longer binds.\n\nCharge the new listener during migration, like reqsk_queue_migrated()\nalready does for queue->young and queue->qlen."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:32:58.414Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e98f0d80b9cccb5f828425d2004f9686e7d1ae24"},{"url":"https://git.kernel.org/stable/c/b6247e0f96bd825ffb2005257f6177b5e642dee6"},{"url":"https://git.kernel.org/stable/c/585fc5247d14939a561056aa2addd9b7c2b1f670"},{"url":"https://git.kernel.org/stable/c/6e10ee56524a26b250229ad348637825646ddb88"},{"url":"https://git.kernel.org/stable/c/a66e869cf0c90c1e47ae75f72b6482acbfc808ff"},{"url":"https://git.kernel.org/stable/c/d974618b2097453778389d385e3741629c40e0a3"},{"url":"https://git.kernel.org/stable/c/a0ab2ba83e35159d81cec830a92e885ecf8139be"}],"title":"tcp: fix TFO max_qlen accounting across reuseport migration","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74696","datePublished":"2026-08-22T15:32:58.414Z","dateReserved":"2026-08-15T05:44:03.926Z","dateUpdated":"2026-08-22T15:32:58.414Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:44","lastModifiedDate":"2026-08-22 16:16:44","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74696","Ordinal":"1","Title":"tcp: fix TFO max_qlen accounting across reuseport migration","CVE":"CVE-2026-74696","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74696","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TFO max_qlen accounting across reuseport migration\n\nA listener's TCP_FASTOPEN max_qlen stops being accurate and lets through\nfar more pending Fast Open requests than it was configured for.\n\nThis only shows up with SO_REUSEPORT listener migration, where closing a\nlistener hands its still-pending TFO children over to a surviving one.\n\nfastopenq.qlen is charged in tcp_fastopen_create_child() when the child\nis created and uncharged in reqsk_fastopen_remove() when the handshake\ncompletes.  The uncharge follows rsk_listener of the request the child\npoints at, and inet_reqsk_clone() has repointed the child at a new\nrequest owned by the new listener, so the ++ and the -- land on two\ndifferent sockets.  The new listener's qlen drifts negative and its\nlimit no longer binds.\n\nCharge the new listener during migration, like reqsk_queue_migrated()\nalready does for queue->young and queue->qlen.","Type":"Description","Title":"tcp: fix TFO max_qlen accounting across reuseport migration"}]}}}