CVE-2026-74268 (GCVE-0-2026-74268)
Vulnerability from cvelistv5
Published
2026-08-15 05:57
Modified
2026-10-16 18:55
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp: clear sock_ops cb flags before force-closing a child socket A child socket inherits the listener's bpf_sock_ops_cb_flags via sk_clone_lock(). If its setup fails in tcp_v4_syn_recv_sock() / tcp_v6_syn_recv_sock(), the child is freed through put_and_exit, where inet_csk_prepare_forced_close() drops the socket lock and tcp_done() runs without it. If BPF_SOCK_OPS_STATE_CB_FLAG was inherited, tcp_done() -> tcp_set_state() calls tcp_call_bpf(), which expects the lock and trips sock_owned_by_me(): WARNING: include/net/sock.h:1799 at tcp_set_state+0x433/0x550 RIP: 0010:tcp_set_state+0x433/0x550 include/net/sock.h:1799 Call Trace: <IRQ> tcp_done+0xba/0x250 net/ipv4/tcp.c:5095 tcp_v4_syn_recv_sock+0x850/0xa50 net/ipv4/tcp_ipv4.c:1787 tcp_check_req+0xf30/0x1360 net/ipv4/tcp_minisocks.c:926 tcp_v4_rcv+0x1047/0x1b50 net/ipv4/tcp_ipv4.c:2164 </IRQ> The child is freed before it is ever established, so it should run no sock_ops callback. Clear its cb flags in inet_csk_prepare_for_destroy_sock(), the common point for the IPv4, IPv6 and chtls forced-close paths and for the MPTCP ->syn_recv_sock() failure path (dispose_child), which reaches tcp_done() on a child that was never established too.
References
Impacted products
Vendor Product Version
Linux Linux Version: d44874910a26f3a8f81edf873a2473363f07f660
Version: d44874910a26f3a8f81edf873a2473363f07f660
Version: d44874910a26f3a8f81edf873a2473363f07f660
Version: d44874910a26f3a8f81edf873a2473363f07f660
Version: d44874910a26f3a8f81edf873a2473363f07f660
Version: d44874910a26f3a8f81edf873a2473363f07f660
Version: d44874910a26f3a8f81edf873a2473363f07f660
Version: d44874910a26f3a8f81edf873a2473363f07f660
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Exploitation only needs network reachability to a listener whose admin already attached cgroup BPF sock_ops setting BPF_SOCK_OPS_STATE_CB_FLAG (common on Kubernetes/Cilium/cloud nodes).\\nUI:N - No victim interaction is needed beyond normal exposure of a TCP listener; the attacker triggers the bug entirely by sending network packets that complete then fail child socket creation.\\nS:U - Vulnerability impact stays within the kernel on the host receiving the traffic; it does not cross VM, container runtime, or IOMMU security boundaries and represents standard in-kernel memory/lock safety impact.\\nC:H - Inherited BPF_SOCK_OPS_STATE_CB_FLAG causes tcp_call_bpf() to run on an unlocked, partially torn-down child socket; BPF helpers can read tcp_sock fields without proper locking, enabling unsynchronized kernel memory reads that could disclose sensitive data.\\nI:H - tcp_call_bpf() marks is_locked_tcp_sock while the socket lock was dropped, allowing cgroup BPF sock_ops programs to call bpf_setsockopt and modify tcp_sock/kernel state during forced close, creating plausible memory corruption and control-flow compromise primitives.\\nA:H - sock_owned_by_me() WARN fires on this path and concurrent BPF access during tcp_done()/inet_csk_destroy_sock() can cause kernel oops or panic; remote attackers can repeatedly trigger the softirq failure path for denial of service on internet-facing BPF-enabled servers.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"5d5389b2c37ca00da61d1407618ebe15abae0c8b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"9fffa6465851a1910a6e9cb7272787dd615b26b1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"fe23d56e9266d58ba5c380f1970118eedeee0b68\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"ce311bd2e36596f0aa2c92ca86fb3e019ac57eae\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"8874dafc9099bc49c2e5ebba030f85d276421f92\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44874910a26f3a8f81edf873a2473363f07f660\", \"lessThan\": \"990348e5bb457697c2f1f7f7b65154a3334d9d2b\", \"versionType\": \"git\"}], \"programFiles\": [\"include/net/tcp.h\", \"net/ipv4/inet_connection_sock.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.16\", \"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\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/tcp.h\", \"net/ipv4/inet_connection_sock.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5d5389b2c37ca00da61d1407618ebe15abae0c8b\"}, {\"url\": \"https://git.kernel.org/stable/c/9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d\"}, {\"url\": \"https://git.kernel.org/stable/c/71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f\"}, {\"url\": \"https://git.kernel.org/stable/c/9fffa6465851a1910a6e9cb7272787dd615b26b1\"}, {\"url\": \"https://git.kernel.org/stable/c/fe23d56e9266d58ba5c380f1970118eedeee0b68\"}, {\"url\": \"https://git.kernel.org/stable/c/ce311bd2e36596f0aa2c92ca86fb3e019ac57eae\"}, {\"url\": \"https://git.kernel.org/stable/c/8874dafc9099bc49c2e5ebba030f85d276421f92\"}, {\"url\": \"https://git.kernel.org/stable/c/990348e5bb457697c2f1f7f7b65154a3334d9d2b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: clear sock_ops cb flags before force-closing a child socket\\n\\nA child socket inherits the listener\u0027s bpf_sock_ops_cb_flags via\\nsk_clone_lock(). If its setup fails in tcp_v4_syn_recv_sock() /\\ntcp_v6_syn_recv_sock(), the child is freed through put_and_exit, where\\ninet_csk_prepare_forced_close() drops the socket lock and tcp_done() runs\\nwithout it.\\n\\nIf BPF_SOCK_OPS_STATE_CB_FLAG was inherited, tcp_done() -\u003e tcp_set_state()\\ncalls tcp_call_bpf(), which expects the lock and trips sock_owned_by_me():\\n\\n  WARNING: include/net/sock.h:1799 at tcp_set_state+0x433/0x550\\n  RIP: 0010:tcp_set_state+0x433/0x550 include/net/sock.h:1799\\n  Call Trace:\\n   \u003cIRQ\u003e\\n   tcp_done+0xba/0x250 net/ipv4/tcp.c:5095\\n   tcp_v4_syn_recv_sock+0x850/0xa50 net/ipv4/tcp_ipv4.c:1787\\n   tcp_check_req+0xf30/0x1360 net/ipv4/tcp_minisocks.c:926\\n   tcp_v4_rcv+0x1047/0x1b50 net/ipv4/tcp_ipv4.c:2164\\n   \u003c/IRQ\u003e\\n\\nThe child is freed before it is ever established, so it should run no\\nsock_ops callback. Clear its cb flags in inet_csk_prepare_for_destroy_sock(),\\nthe common point for the IPv4, IPv6 and chtls forced-close paths and for the\\nMPTCP -\u003esyn_recv_sock() failure path (dispose_child), which reaches tcp_done()\\non a child that was never established too.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.110\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"4.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-09-14T11:58:42.864Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74268\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:28.993Z\", \"dateReserved\": \"2026-08-15T05:44:03.878Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:57:42.920Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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