iommu/arm-smmu: Defer probe of clients after smmu device bound

{
  "id": "aaf9416f1767f053794971701228558d1769f8d37d3c24253190ff24aacbafb7",
  "url": "https://osv.dev/vulnerability/CVE-2024-56568",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu/arm-smmu: Defer probe of clients after smmu device bound",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Defer probe of clients after smmu device bound Null pointer dereference occurs due to a race between smmu driver probe and client driver probe, when of_dma_configure() for client is called after the iommu_device_register() for smmu driver probe has executed but before the driver_bound() for smmu driver has been called. Following is how the race occurs: T1:Smmu device probe T2: Client device probe really_probe() arm_smmu_device_probe() iommu_device_register() really_probe() platform_dma_configure() of_dma_configure() of_dma_configure_id() of_iommu_configure() iommu_probe_device() iommu_init_device() arm_smmu_probe_device() arm_smmu_get_by_fwnode() driver_find_device_by_fwnode() driver_find_device() next_device() klist_next() /* null ptr assigned to smmu */ /* null ptr dereference while smmu->streamid_mask */ driver_bound() klist_add_tail() When this null smmu pointer is dereferenced later in arm_smmu_probe_device, the device crashes. Fix this by deferring the probe of the client device until the smmu device has bound to the arm smmu driver. [will: Add comment]",
    "evidence": "osv:CVE-2024-56568",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.231",
            "evidence": "/affected/1/ranges"
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            "value": "5.15.174",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.66",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-56568",
      "aliases": [
        "CVE-2024-56568"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
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      "affected": [
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                  "fixed": "dc02407ea952e20c544a078a6be2e6f008327973"
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                  "fixed": "f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5"
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                  "fixed": "4a9485918a042e3114890dfbe19839a1897f8b2c"
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                {
                  "fixed": "5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8"
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                {
                  "fixed": "229e6ee43d2a160a1592b83aad620d6027084aad"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56568.json"
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              "type": "ECOSYSTEM",
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                  "introduced": "6.2.0"
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            "name": "Kernel",
            "ecosystem": "Linux"
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56568.json"
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      ],
      "modified": "2026-10-28T02:30:40.433337763Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/229e6ee43d2a160a1592b83aad620d6027084aad",
        "https://git.kernel.org/stable/c/4a9485918a042e3114890dfbe19839a1897f8b2c",
        "https://git.kernel.org/stable/c/5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8",
        "https://git.kernel.org/stable/c/c2527d07c7e9cda2c6165d5edccf74752baac1b0",
        "https://git.kernel.org/stable/c/dc02407ea952e20c544a078a6be2e6f008327973",
        "https://git.kernel.org/stable/c/f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56568.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56568",
        "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/2024/56xxx/CVE-2024-56568.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2024-56568",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507869,
  "published_at": "2024-12-27T14:23:11.733+00:00"
}