{"affected":[{"affectedData":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/tcp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"319f460237fc2965a80aa9a055044e1da7b3692a","status":"affected","version":"ee9952831cfd0bbe834f4a26489d7dce74582e37","versionType":"git"},{"lessThan":"3bf899438c123c444f6b644a57784dfbb6b15ad6","status":"affected","version":"ee9952831cfd0bbe834f4a26489d7dce74582e37","versionType":"git"},{"lessThan":"046f3c1c2ff450fb7ae53650e9a95e0074a61f3e","status":"affected","version":"ee9952831cfd0bbe834f4a26489d7dce74582e37","versionType":"git"},{"lessThan":"3b72d5a703842f582502d97906f17d6ee122dac2","status":"affected","version":"ee9952831cfd0bbe834f4a26489d7dce74582e37","versionType":"git"},{"lessThan":"8811f4a9836e31c14ecdf79d9f3cb7c5d463265d","status":"affected","version":"ee9952831cfd0bbe834f4a26489d7dce74582e37","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/tcp.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.5"},{"lessThan":"3.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"4.19.*","status":"unaffected","version":"4.19.181","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.106","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.24","versionType":"semver"},{"lessThanOrEqual":"5.11.*","status":"unaffected","version":"5.11.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"5.12","versionType":"original_commit_for_fix"}]}],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","matchCriteriaId":"58EB7158-A900-4601-8CF0-D19F3929BBED","versionEndExcluding":"4.19.181","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","matchCriteriaId":"2A66FDC0-50BA-4BCC-8BFE-2209436DDBF7","versionEndExcluding":"5.4.106","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","matchCriteriaId":"1E692548-C944-4984-9823-EE1EC83F4F2A","versionEndExcluding":"5.10.24","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","matchCriteriaId":"F83144BB-4FAB-40A1-8F52-8690FF516A33","versionEndExcluding":"5.11.7","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:5.12:rc1:*:*:*:*:*:*","matchCriteriaId":"07875739-0CCB-4F48-9330-3D4B6A4064FA","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:5.12:rc2:*:*:*:*:*:*","matchCriteriaId":"DA09B732-04F8-452C-94CF-97644E78684D","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: add sanity tests to TCP_QUEUE_SEQ\n\nQingyu Li reported a syzkaller bug where the repro\nchanges RCV SEQ _after_ restoring data in the receive queue.\n\nmprotect(0x4aa000, 12288, PROT_READ)    = 0\nmmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000\nmmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000\nmmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000\nsocket(AF_INET6, SOCK_STREAM, IPPROTO_IP) = 3\nsetsockopt(3, SOL_TCP, TCP_REPAIR, [1], 4) = 0\nconnect(3, {sa_family=AF_INET6, sin6_port=htons(0), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, \"::1\", &sin6_addr), sin6_scope_id=0}, 28) = 0\nsetsockopt(3, SOL_TCP, TCP_REPAIR_QUEUE, [1], 4) = 0\nsendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=\"0x0000000000000003\\0\\0\", iov_len=20}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 20\nsetsockopt(3, SOL_TCP, TCP_REPAIR, [0], 4) = 0\nsetsockopt(3, SOL_TCP, TCP_QUEUE_SEQ, [128], 4) = 0\nrecvfrom(3, NULL, 20, 0, NULL, NULL)    = -1 ECONNRESET (Connection reset by peer)\n\nsyslog shows:\n[  111.205099] TCP recvmsg seq # bug 2: copied 80, seq 0, rcvnxt 80, fl 0\n[  111.207894] WARNING: CPU: 1 PID: 356 at net/ipv4/tcp.c:2343 tcp_recvmsg_locked+0x90e/0x29a0\n\nThis should not be allowed. TCP_QUEUE_SEQ should only be used\nwhen queues are empty.\n\nThis patch fixes this case, and the tx path as well."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: agregar pruebas de cordura a TCP_QUEUE_SEQ Qingyu Li informó un error de syzkaller donde la reproducción cambia RCV SEQ _después_ de restaurar datos en la cola de recepción. mprotect(0x4aa000, 12288, PROT_LECTURA) = 0 mmap(0x1ffff000, 4096, PROT_NINGUNO, MAPA_PRIVADO|MAPA_FIJO|MAPA_ANÓNIMO, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_LECTURA|PROT_ESCRITURA|PROT_EJECUCIÓN, MAPA_PRIVADO|MAPA_FIJO|MAPA_ANÓNIMO, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NINGUNO, MAPA_PRIVADO|MAPA_FIJO|MAPA_ANÓNIMO, -1, 0) = 0x21000000 socket(AF_INET6, SOCK_STREAM, IPPROTO_IP) = 3 setsockopt(3, SOL_TCP, TCP_REPAIR, [1], 4) = 0 connect(3, {sa_family=AF_INET6, sin6_port=htons(0), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, \"::1\", &sin6_addr), sin6_scope_id=0}, 28) = 0 setsockopt(3, SOL_TCP, TCP_REPAIR_QUEUE, [1], 4) = 0 sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=\"0x0000000000000003\\0\\0\", iov_len=20}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 20 setsockopt(3, SOL_TCP, TCP_REPAIR, [0], 4) = 0 setsockopt(3, SOL_TCP, TCP_QUEUE_SEQ, [128], 4) = 0 recvfrom(3, NULL, 20, 0, NULL, NULL) = -1 ECONNRESET (Conexión restablecida por el par) syslog muestra: [ 111.205099] TCP recvmsg seq # error 2: copiado 80, seq 0, rcvnxt 80, fl 0 [ 111.207894] ADVERTENCIA: CPU: 1 PID: 356 en net/ipv4/tcp.c:2343 tcp_recvmsg_locked+0x90e/0x29a0 Esto no debería estar permitido. TCP_QUEUE_SEQ solo se debe utilizar cuando las colas están vacías. Este parche corrige este caso y también la ruta de transmisión."}],"id":"CVE-2021-4442","lastModified":"2026-06-17T04:19:46.090","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"exploitabilityScore":1.8,"impactScore":3.6,"source":"nvd@nist.gov","type":"Primary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2021-4442","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2024-09-10T15:27:19.469739Z","version":"2.0.3"}}]},"published":"2024-08-29T11:15:23.413","references":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Exploit","Patch"],"url":"https://git.kernel.org/stable/c/046f3c1c2ff450fb7ae53650e9a95e0074a61f3e"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Exploit","Patch"],"url":"https://git.kernel.org/stable/c/319f460237fc2965a80aa9a055044e1da7b3692a"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Exploit","Patch"],"url":"https://git.kernel.org/stable/c/3b72d5a703842f582502d97906f17d6ee122dac2"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Exploit","Patch"],"url":"https://git.kernel.org/stable/c/3bf899438c123c444f6b644a57784dfbb6b15ad6"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Exploit","Patch"],"url":"https://git.kernel.org/stable/c/8811f4a9836e31c14ecdf79d9f3cb7c5d463265d"}],"sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","vulnStatus":"Analyzed","weaknesses":[{"description":[{"lang":"en","value":"NVD-CWE-noinfo"}],"source":"nvd@nist.gov","type":"Primary"}]}