{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74696","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.926Z","datePublished":"2026-08-22T15:32:58.414Z","dateUpdated":"2026-08-22T15:32:58.414Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-22T15:32:58.414Z"},"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv4/inet_connection_sock.c"],"versions":[{"version":"54b92e84193749c9968aff2dd46e3b0f42643e18","lessThan":"e98f0d80b9cccb5f828425d2004f9686e7d1ae24","status":"affected","versionType":"git"},{"version":"54b92e84193749c9968aff2dd46e3b0f42643e18","lessThan":"b6247e0f96bd825ffb2005257f6177b5e642dee6","status":"affected","versionType":"git"},{"version":"54b92e84193749c9968aff2dd46e3b0f42643e18","lessThan":"585fc5247d14939a561056aa2addd9b7c2b1f670","status":"affected","versionType":"git"},{"version":"54b92e84193749c9968aff2dd46e3b0f42643e18","lessThan":"6e10ee56524a26b250229ad348637825646ddb88","status":"affected","versionType":"git"},{"version":"54b92e84193749c9968aff2dd46e3b0f42643e18","lessThan":"a66e869cf0c90c1e47ae75f72b6482acbfc808ff","status":"affected","versionType":"git"},{"version":"54b92e84193749c9968aff2dd46e3b0f42643e18","lessThan":"d974618b2097453778389d385e3741629c40e0a3","status":"affected","versionType":"git"},{"version":"54b92e84193749c9968aff2dd46e3b0f42643e18","lessThan":"a0ab2ba83e35159d81cec830a92e885ecf8139be","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/ipv4/inet_connection_sock.c"],"versions":[{"version":"5.14","status":"affected"},{"version":"0","lessThan":"5.14","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.152","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.104","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"5.14","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.2"}]}]}],"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"}}}}