tcp: clear sock_ops cb flags before force-closing a child socket

{
  "id": "4dfcbd3df2f7d218753208b8d28768f97fd9e47393e02585502d65d74d8f8c7a",
  "url": "https://osv.dev/vulnerability/CVE-2026-74268",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tcp: clear sock_ops cb flags before force-closing a child socket",
    "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: 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 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.",
    "evidence": "osv:CVE-2026-74268",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-74268",
      "aliases": [
        "CVE-2026-74268"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d44874910a26f3a8f81edf873a2473363f07f660"
                },
                {
                  "fixed": "5d5389b2c37ca00da61d1407618ebe15abae0c8b"
                },
                {
                  "fixed": "9f30ba9aa0270a18fdd1e6cd426c480c35f7de9d"
                },
                {
                  "fixed": "71e9c53220abd7f5a45aa4d5e5b420d3479f3a4f"
                },
                {
                  "fixed": "9fffa6465851a1910a6e9cb7272787dd615b26b1"
                },
                {
                  "fixed": "fe23d56e9266d58ba5c380f1970118eedeee0b68"
                },
                {
                  "fixed": "ce311bd2e36596f0aa2c92ca86fb3e019ac57eae"
                },
                {
                  "fixed": "8874dafc9099bc49c2e5ebba030f85d276421f92"
                },
                {
                  "fixed": "990348e5bb457697c2f1f7f7b65154a3334d9d2b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74268.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.16.0"
                },
                {
                  "fixed": "5.10.270"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.221"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.188"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74268.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:40.936216631Z",
      "provider": "osv",
      "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",
        "https://git.kernel.org/stable/c/9fffa6465851a1910a6e9cb7272787dd615b26b1",
        "https://git.kernel.org/stable/c/ce311bd2e36596f0aa2c92ca86fb3e019ac57eae",
        "https://git.kernel.org/stable/c/fe23d56e9266d58ba5c380f1970118eedeee0b68",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74268.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74268",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74268.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74268",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508726,
  "published_at": "2026-08-15T05:57:42.92+00:00"
}