netfilter: conntrack: Avoid nf_ct_helper_hash uses after free

{
  "id": "d6577e804782b29473b92567eb25576cac2a0a6935f9f8e90d89d94b9fb9e95d",
  "url": "https://osv.dev/vulnerability/CVE-2023-53619",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfilter: conntrack: Avoid nf_ct_helper_hash uses after free",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: Avoid nf_ct_helper_hash uses after free If nf_conntrack_init_start() fails (for example due to a register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini() clean-up path frees the nf_ct_helper_hash map. When built with NF_CONNTRACK=y, further netfilter modules (e.g: netfilter_conntrack_ftp) can still be loaded and call nf_conntrack_helpers_register(), independently of whether nf_conntrack initialized correctly. This accesses the nf_ct_helper_hash dangling pointer and causes a uaf, possibly leading to random memory corruption. This patch guards nf_conntrack_helper_register() from accessing a freed or uninitialized nf_ct_helper_hash pointer and fixes possible uses-after-free when loading a conntrack module.",
    "evidence": "osv:CVE-2023-53619",
    "products": [
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        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
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    "severity": "high",
    "structured": {
      "id": "CVE-2023-53619",
      "aliases": [
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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                  "fixed": "61c7a5256543ae7d24cd9d21853d514c8632e1e9"
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      ],
      "modified": "2026-10-28T02:30:37.425764668Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0",
        "https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034",
        "https://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7",
        "https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9",
        "https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b",
        "https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566",
        "https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175",
        "https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53619.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53619",
        "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/2023/53xxx/CVE-2023-53619.json"
      }
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    "related_cves": [
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        "value": "CVE-2023-53619",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504593,
  "published_at": "2025-10-07T15:19:26.003+00:00"
}