{"id":"CVE-2026-74268","title":"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()","summary":"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 i…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-414"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:17:35.287","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74268","references":[{"url":"https://git.kernel.org/stable/c/5d5389b2c37ca00da61d1407618ebe15abae0c8b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8874dafc9099bc49c2e5ebba030f85d276421f92","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/990348e5bb457697c2f1f7f7b65154a3334d9d2b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9fffa6465851a1910a6e9cb7272787dd615b26b1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce311bd2e36596f0aa2c92ca86fb3e019ac57eae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fe23d56e9266d58ba5c380f1970118eedeee0b68","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74268.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-74268"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2516842"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74268"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74268"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-74268.mbox"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00714,"epssPercentile":0.53477,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T18:51:48.226503Z"},"scores":{"nvd":9.8,"vendor":5.5,"cna":9.8},"ingestedAt":"2026-09-14T15:23:07.456Z","slug":"CVE-2026-74268","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74268.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":230319,"id":"CVE-2026-74268","ts":1793130917531,"field":"cvss","old":"5.5","new":"9.8"},{"seq":230318,"id":"CVE-2026-74268","ts":1793130917531,"field":"severity","old":"medium","new":"critical"},{"seq":223619,"id":"CVE-2026-74268","ts":1792238338740,"field":"cvss","old":"9.8","new":"5.5"},{"seq":223618,"id":"CVE-2026-74268","ts":1792238338740,"field":"severity","old":"critical","new":"medium"},{"seq":223360,"id":"CVE-2026-74268","ts":1792180207531,"field":"cvss","old":"5.5","new":"9.8"},{"seq":223359,"id":"CVE-2026-74268","ts":1792180207531,"field":"severity","old":"medium","new":"critical"},{"seq":214191,"id":"CVE-2026-74268","ts":1790841343629,"field":"cvss","old":"9.8","new":"5.5"},{"seq":214190,"id":"CVE-2026-74268","ts":1790841343629,"field":"severity","old":"critical","new":"medium"}]}