{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43198", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.992Z", "datePublished": "2026-05-06T11:28:05.569Z", "dateUpdated": "2026-08-05T12:26:29.717Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:29.717Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "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": [{"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": "fe89b2f05b854847784f91127319172945c1fadd", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7178e2a8027423b2af17ab95df73a749a5b72e5b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "858d2a4f67ff69e645a43487ef7ea7f28f06deae", "status": "affected", "versionType": "git"}]}, 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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."}], "id": "CVE-2026-43198", "lastModified": "2026-07-20T12:19:22.073", "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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", 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