{"cve":"CVE-2026-74268","nvd":{"published":"2026-08-15T06:22:26.183","modified":"2026-10-16T19:17:35.287","status":"Received","description":"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's 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() -> 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   <IRQ>\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   </IRQ>\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 ->syn_recv_sock() failure path (dispose_child), which reaches tcp_done()\non a child that was never established too.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://git.kernel.org/stable/c/5d5389b2c37ca00da61d1407618ebe15abae0c8b","https://git.kernel.org/stable/c/71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f","https://git.kernel.org/stable/c/8874dafc9099bc49c2e5ebba030f85d276421f92","https://git.kernel.org/stable/c/990348e5bb457697c2f1f7f7b65154a3334d9d2b","https://git.kernel.org/stable/c/9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-74268","score":0.00714,"percentile":0.53398,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}