CVE-2021-4442 (GCVE-0-2021-4442)

Vulnerability from cvelistv5 – Published: 2024-08-29 09:05 – Updated: 2026-05-11 13:44
VLAI
Title
tcp: add sanity tests to TCP_QUEUE_SEQ
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp: add sanity tests to TCP_QUEUE_SEQ Qingyu Li reported a syzkaller bug where the repro changes RCV SEQ _after_ restoring data in the receive queue. mprotect(0x4aa000, 12288, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -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 (Connection reset by peer) syslog shows: [ 111.205099] TCP recvmsg seq # bug 2: copied 80, seq 0, rcvnxt 80, fl 0 [ 111.207894] WARNING: CPU: 1 PID: 356 at net/ipv4/tcp.c:2343 tcp_recvmsg_locked+0x90e/0x29a0 This should not be allowed. TCP_QUEUE_SEQ should only be used when queues are empty. This patch fixes this case, and the tx path as well.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ee9952831cfd0bbe834f4a26489d7dce74582e37 , < 319f460237fc2965a80aa9a055044e1da7b3692a (git)
Affected: ee9952831cfd0bbe834f4a26489d7dce74582e37 , < 3bf899438c123c444f6b644a57784dfbb6b15ad6 (git)
Affected: ee9952831cfd0bbe834f4a26489d7dce74582e37 , < 046f3c1c2ff450fb7ae53650e9a95e0074a61f3e (git)
Affected: ee9952831cfd0bbe834f4a26489d7dce74582e37 , < 3b72d5a703842f582502d97906f17d6ee122dac2 (git)
Affected: ee9952831cfd0bbe834f4a26489d7dce74582e37 , < 8811f4a9836e31c14ecdf79d9f3cb7c5d463265d (git)
Create a notification for this product.
Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 4.19.181 , ≤ 4.19.* (semver)
Unaffected: 5.4.106 , ≤ 5.4.* (semver)
Unaffected: 5.10.24 , ≤ 5.10.* (semver)
Unaffected: 5.11.7 , ≤ 5.11.* (semver)
Unaffected: 5.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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\", \u0026sin6_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."
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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 inform\u00f3 un error de syzkaller donde la reproducci\u00f3n cambia RCV SEQ _despu\u00e9s_ de restaurar datos en la cola de recepci\u00f3n. mprotect(0x4aa000, 12288, PROT_LECTURA) = 0 mmap(0x1ffff000, 4096, PROT_NINGUNO, MAPA_PRIVADO|MAPA_FIJO|MAPA_AN\u00d3NIMO, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_LECTURA|PROT_ESCRITURA|PROT_EJECUCI\u00d3N, MAPA_PRIVADO|MAPA_FIJO|MAPA_AN\u00d3NIMO, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NINGUNO, MAPA_PRIVADO|MAPA_FIJO|MAPA_AN\u00d3NIMO, -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\\\", \u0026amp;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 (Conexi\u00f3n 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 deber\u00eda estar permitido. TCP_QUEUE_SEQ solo se debe utilizar cuando las colas est\u00e1n vac\u00edas. Este parche corrige este caso y tambi\u00e9n la ruta de transmisi\u00f3n.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.5\",\"versionEndExcluding\":\"4.19.181\",\"matchCriteriaId\":\"58EB7158-A900-4601-8CF0-D19F3929BBED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.106\",\"matchCriteriaId\":\"2A66FDC0-50BA-4BCC-8BFE-2209436DDBF7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.24\",\"matchCriteriaId\":\"1E692548-C944-4984-9823-EE1EC83F4F2A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.11.7\",\"matchCriteriaId\":\"F83144BB-4FAB-40A1-8F52-8690FF516A33\"},{\"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\"}]}]}],\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Exploit\",\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-4442\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:27:19.469739Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:13.911Z\"}}], \"cna\": {\"title\": \"tcp: add sanity tests to TCP_QUEUE_SEQ\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ee9952831cfd0bbe834f4a26489d7dce74582e37\", \"lessThan\": \"319f460237fc2965a80aa9a055044e1da7b3692a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee9952831cfd0bbe834f4a26489d7dce74582e37\", \"lessThan\": \"3bf899438c123c444f6b644a57784dfbb6b15ad6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee9952831cfd0bbe834f4a26489d7dce74582e37\", \"lessThan\": \"046f3c1c2ff450fb7ae53650e9a95e0074a61f3e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee9952831cfd0bbe834f4a26489d7dce74582e37\", \"lessThan\": \"3b72d5a703842f582502d97906f17d6ee122dac2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ee9952831cfd0bbe834f4a26489d7dce74582e37\", \"lessThan\": \"8811f4a9836e31c14ecdf79d9f3cb7c5d463265d\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/tcp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.181\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.106\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/tcp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/319f460237fc2965a80aa9a055044e1da7b3692a\"}, {\"url\": \"https://git.kernel.org/stable/c/3bf899438c123c444f6b644a57784dfbb6b15ad6\"}, {\"url\": \"https://git.kernel.org/stable/c/046f3c1c2ff450fb7ae53650e9a95e0074a61f3e\"}, {\"url\": \"https://git.kernel.org/stable/c/3b72d5a703842f582502d97906f17d6ee122dac2\"}, {\"url\": \"https://git.kernel.org/stable/c/8811f4a9836e31c14ecdf79d9f3cb7c5d463265d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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\\\", \u0026sin6_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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.181\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.106\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.24\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.7\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12\", \"versionStartIncluding\": \"3.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T06:59:56.297Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-4442\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T06:59:56.297Z\", \"dateReserved\": \"2024-08-29T09:00:39.580Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-29T09:05:37.288Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.