{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d44874910a26f3a8f81edf873a2473363f07f660"
            },
            {
              "fixed": "ce311bd2e36596f0aa2c92ca86fb3e019ac57eae"
            },
            {
              "fixed": "8874dafc9099bc49c2e5ebba030f85d276421f92"
            },
            {
              "fixed": "990348e5bb457697c2f1f7f7b65154a3334d9d2b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.16.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74268.json"
  },
  "details": "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() -\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.",
  "id": "CVE-2026-74268",
  "modified": "2026-08-18T03:31:20.203486365Z",
  "published": "2026-08-15T05:57:42.920Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8874dafc9099bc49c2e5ebba030f85d276421f92"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/990348e5bb457697c2f1f7f7b65154a3334d9d2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce311bd2e36596f0aa2c92ca86fb3e019ac57eae"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74268.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74268"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tcp: clear sock_ops cb flags before force-closing a child socket"
}