bpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener

{
  "id": "6eefc9f43f3ebfb4e23502326e73a53f351d6684e55956c2696deffbc378fdeb",
  "url": "https://osv.dev/vulnerability/CVE-2023-52986",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener A listening socket linked to a sockmap has its sk_prot overridden. It points to one of the struct proto variants in tcp_bpf_prots. The variant depends on the socket's family and which sockmap programs are attached. A child socket cloned from a TCP listener initially inherits their sk_prot. But before cloning is finished, we restore the child's proto to the listener's original non-tcp_bpf_prots one. This happens in tcp_create_openreq_child -> tcp_bpf_clone. Today, in tcp_bpf_clone we detect if the child's proto should be restored by checking only for the TCP_BPF_BASE proto variant. This is not correct. The sk_prot of listening socket linked to a sockmap can point to to any variant in tcp_bpf_prots. If the listeners sk_prot happens to be not the TCP_BPF_BASE variant, then the child socket unintentionally is left if the inherited sk_prot by tcp_bpf_clone. This leads to issues like infinite recursion on close [1], because the child state is otherwise not set up for use with tcp_bpf_prot operations. Adjust the check in tcp_bpf_clone to detect all of tcp_bpf_prots variants. Note that it wouldn't be sufficient to check the socket state when overriding the sk_prot in tcp_bpf_update_proto in order to always use the TCP_BPF_BASE variant for listening sockets. Since commit b8b8315e39ff (\"bpf, sockmap: Remove unhash handler for BPF sockmap usage\") it is",
    "evidence": "osv:CVE-2023-52986",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.168",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-52986",
      "aliases": [
        "CVE-2023-52986"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e80251555f0befd1271e74b080bccf0ff0348bfc"
                },
                {
                  "fixed": "9bd6074e1872d22190a8da30e796cbf937d334f0"
                },
                {
                  "fixed": "c681d7a4ed3d360de0574f4d6b7305a8de8dc54f"
                },
                {
                  "fixed": "12b0ec7c6953e1602957926439e5297095d7d065"
                },
                {
                  "fixed": "ddce1e091757d0259107c6c0c7262df201de2b66"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52986.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.7.0"
                },
                {
                  "fixed": "5.10.168"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.93"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52986.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.779911770Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/12b0ec7c6953e1602957926439e5297095d7d065",
        "https://git.kernel.org/stable/c/9bd6074e1872d22190a8da30e796cbf937d334f0",
        "https://git.kernel.org/stable/c/c681d7a4ed3d360de0574f4d6b7305a8de8dc54f",
        "https://git.kernel.org/stable/c/ddce1e091757d0259107c6c0c7262df201de2b66",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52986.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52986",
        "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/2023/52xxx/CVE-2023-52986.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-52986",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 487476,
  "published_at": "2025-03-27T16:43:23.617+00:00"
}