CVE-2026-43198

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The vulnerable path is in the packet receive and TCP handshake path before any application authentication.\nAC:L - The race can be exercised by driving many concurrent TCP handshakes and follow-up packets against the same listener, so the attacker controls the relevant network-side timing. Under the required conservative rule, this is Low complexity.\nPR:N - No local account, capability, or prior authentication is required to send TCP connection attempts to an exposed listening service. The vulnerable kernel code runs before the connection is handed to userspace.\nUI:N - No victim user action is needed beyond the target system already running a reachable dual-stack TCP listener. Packets alone trigger the vulnerable path.\nS:U - The impact remains within the target kernel and its networking state. This is not a VM escape, IOMMU bypass, or cross-authority boundary change.\nC:H - The bug leaves a newly created child socket temporarily using the listener's IPv6 private pointer, allowing concurrent reads of the wrong kernel socket private area and associated pointer-bearing state. Conservatively, this kernel memory corruption/race is treated as capable of high confidentiality impact.\nI:H - Operations on the child can write through the stale pinet6 pointer into the listener's IPv6 state, and related cleanup paths can affect pointer-backed socket options. Conservatively, this is high integrity impact because kernel socket state can be corrupted.\nA:H - Corrupting or freeing the wrong socket IPv6 state can lead to kernel warnings, oopses, or crashes. The trigger can be repeated remotely with connection floods, so availability impact is High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/inet_connection_sock.h", "include/net/tcp.h", "net/ipv4/syncookies.c", "net/ipv4/tcp_fastopen.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_minisocks.c", "net/ipv6/tcp_ipv6.c", "net/mptcp/subflow.c", "net/smc/af_smc.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "aef4a9ae95d1bc4f7897065011e6261026719aeb", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "dad1fe7db6c6519138430ac8f5e589c18f83bfc9", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a7e761ba55efaa9c49e0afdd304bb78167af3429", "status": "affected", "versionType": "git"}, {"version": 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"net/ipv4/syncookies.c", "net/ipv4/tcp_fastopen.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_minisocks.c", "net/ipv6/tcp_ipv6.c", "net/mptcp/subflow.c", "net/smc/af_smc.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": 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A race condition exists in the TCP (Transmission Control Protocol) IPv6 (Internet Protocol version 6) socket handling, specifically within the tcp_v6_syn_recv_sock() function. This occurs because a child socket becomes visible in the TCP hash table before its IPv6-specific information is fully initialized. 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A race condition exists in the TCP (Transmission Control Protocol) IPv6 (Internet Protocol version 6) socket handling, specifically within the tcp_v6_syn_recv_sock() function. This occurs because a child socket becomes visible in the TCP hash table before its IPv6-specific information is fully initialized. A remote attacker could potentially exploit this timing window, leading to an unstable system state or unexpected behavior, which may result in a denial of service (DoS)."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-821", "description": "Incorrect Synchronization"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-20T12:04:45.125Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43198", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:15:38.526803Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:15:39.436Z"}}], "cna": {"title": "tcp: fix potential race in tcp_v6_syn_recv_sock()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - An unauthenticated remote peer can reach this through ordinary IPv4 TCP packets delivered to a dual-stack IPv6 listener with IPV6_V6ONLY disabled, which is the default on Linux. The vulnerable path is in the packet receive and TCP handshake path before any application authentication.\nAC:L - The race can be exercised by driving many concurrent TCP handshakes and follow-up packets against the same listener, so the attacker controls the relevant network-side timing. Under the required conservative rule, this is Low complexity.\nPR:N - No local account, capability, or prior authentication is required to send TCP connection attempts to an exposed listening service. The vulnerable kernel code runs before the connection is handed to userspace.\nUI:N - No victim user action is needed beyond the target system already running a reachable dual-stack TCP listener. Packets alone trigger the vulnerable path.\nS:U - The impact remains within the target kernel and its networking state. This is not a VM escape, IOMMU bypass, or cross-authority boundary change.\nC:H - The bug leaves a newly created child socket temporarily using the listener's IPv6 private pointer, allowing concurrent reads of the wrong kernel socket private area and associated pointer-bearing state. Conservatively, this kernel memory corruption/race is treated as capable of high confidentiality impact.\nI:H - Operations on the child can write through the stale pinet6 pointer into the listener's IPv6 state, and related cleanup paths can affect pointer-backed socket options. Conservatively, this is high integrity impact because kernel socket state can be corrupted.\nA:H - Corrupting or freeing the wrong socket IPv6 state can lead to kernel warnings, oopses, or crashes. The trigger can be repeated remotely with connection floods, so availability impact is High."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "aef4a9ae95d1bc4f7897065011e6261026719aeb", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "dad1fe7db6c6519138430ac8f5e589c18f83bfc9", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "a7e761ba55efaa9c49e0afdd304bb78167af3429", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "cd644e6dc72eec8d9d988717ea1c54f8668ded69", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "9ed654e340f4c73bc6f0af2fbc90ac293e645ce0", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "fe89b2f05b854847784f91127319172945c1fadd", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7178e2a8027423b2af17ab95df73a749a5b72e5b", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "858d2a4f67ff69e645a43487ef7ea7f28f06deae", "versionType": "git"}], "programFiles": ["include/net/inet_connection_sock.h", "include/net/tcp.h", "net/ipv4/syncookies.c", "net/ipv4/tcp_fastopen.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_minisocks.c", "net/ipv6/tcp_ipv6.c", "net/mptcp/subflow.c", "net/smc/af_smc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.110", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.16", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.6", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["include/net/inet_connection_sock.h", "include/net/tcp.h", "net/ipv4/syncookies.c", "net/ipv4/tcp_fastopen.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_minisocks.c", "net/ipv6/tcp_ipv6.c", "net/mptcp/subflow.c", "net/smc/af_smc.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/aef4a9ae95d1bc4f7897065011e6261026719aeb"}, {"url": "https://git.kernel.org/stable/c/dad1fe7db6c6519138430ac8f5e589c18f83bfc9"}, {"url": "https://git.kernel.org/stable/c/a7e761ba55efaa9c49e0afdd304bb78167af3429"}, {"url": "https://git.kernel.org/stable/c/cd644e6dc72eec8d9d988717ea1c54f8668ded69"}, {"url": "https://git.kernel.org/stable/c/9ed654e340f4c73bc6f0af2fbc90ac293e645ce0"}, {"url": "https://git.kernel.org/stable/c/fe89b2f05b854847784f91127319172945c1fadd"}, {"url": "https://git.kernel.org/stable/c/7178e2a8027423b2af17ab95df73a749a5b72e5b"}, {"url": "https://git.kernel.org/stable/c/858d2a4f67ff69e645a43487ef7ea7f28f06deae"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix potential race in tcp_v6_syn_recv_sock()\n\nCode in tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock()\nis done too late.\n\nAfter tcp_v4_syn_recv_sock(), the child socket is already visible\nfrom TCP ehash table and other cpus might use it.\n\nSince newinet->pinet6 is still pointing to the listener ipv6_pinfo\nbad things can happen as syzbot found.\n\nMove the problematic code in tcp_v6_mapped_child_init()\nand call this new helper from tcp_v4_syn_recv_sock() before\nthe ehash insertion.\n\nThis allows the removal of one tcp_sync_mss(), since\ntcp_v4_syn_recv_sock() will call it with the correct\ncontext."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.270", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.110", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.16", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.6", "versionStartIncluding": "2.6.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-14T11:58:18.188Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43198", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:16:23.821Z", "dateReserved": "2026-05-01T14:12:55.992Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-06T11:28:05.569Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock()\nis done too late.\n\nAfter tcp_v4_syn_recv_sock(), the child socket is already visible\nfrom TCP ehash table and other cpus might use it.\n\nSince newinet->pinet6 is still pointing to the listener ipv6_pinfo\nbad things can happen as syzbot found.\n\nMove the problematic code in tcp_v6_mapped_child_init()\nand call this new helper from tcp_v4_syn_recv_sock() before\nthe ehash insertion.\n\nThis allows the removal of one tcp_sync_mss(), since\ntcp_v4_syn_recv_sock() will call it with the correct\ncontext."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntcp: corrige una condici\u00f3n de carrera potencial en tcp_v6_syn_recv_sock()\n\nEl c\u00f3digo en tcp_v6_syn_recv_sock() despu\u00e9s de la llamada a tcp_v4_syn_recv_sock()\nse ejecuta demasiado tarde.\n\nDespu\u00e9s de tcp_v4_syn_recv_sock(), el socket hijo ya es visible\ndesde la tabla ehash de TCP y otras CPUs podr\u00edan usarlo.\n\nDado que newinet -> pinet6 sigue apuntando al ipv6_pinfo del oyente,\npueden ocurrir cosas malas como encontr\u00f3 syzbot.\n\nMover el c\u00f3digo problem\u00e1tico a tcp_v6_mapped_child_init()\ny llamar a esta nueva funci\u00f3n auxiliar desde tcp_v4_syn_recv_sock() antes\nde la inserci\u00f3n en ehash.\n\nEsto permite la eliminaci\u00f3n de un tcp_sync_mss(), ya que\ntcp_v4_syn_recv_sock() lo llamar\u00e1 con el contexto\ncorrecto."}], "id": "CVE-2026-43198", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": 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{"bugzilla": {"description": "kernel: tcp: fix potential race in tcp_v6_syn_recv_sock()", "id": "2467228", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467228"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-821", "details": ["A flaw was found in the Linux kernel. A race condition exists in the TCP (Transmission Control Protocol) IPv6 (Internet Protocol version 6) socket handling, specifically within the tcp_v6_syn_recv_sock() function. This occurs because a child socket becomes visible in the TCP hash table before its IPv6-specific information is fully initialized. A remote attacker could potentially exploit this timing window, leading to an unstable system state or unexpected behavior, which may result in a denial of service (DoS)."], "name": "CVE-2026-43198", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43198\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43198\nhttps://lore.kernel.org/linux-cve-announce/2026050645-CVE-2026-43198-0870@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,fe89b2f05b854847784f91127319172945c1fadd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7178e2a8027423b2af17ab95df73a749a5b72e5b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,858d2a4f67ff69e645a43487ef7ea7f28f06deae)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T16:15:06.987610+00:00", "updated": "2026-05-11T23:00:19.500343+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}