{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2024-56568",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-56568",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-12-27T14:23:11.733Z",
    "updatedAt": "2026-05-11T20:54:57.262Z",
    "importedAt": "2026-10-24T01:57:20.494Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "iommu/arm-smmu: Defer probe of clients after smmu device bound",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/arm-smmu: Defer probe of clients after smmu device bound\n\nNull pointer dereference occurs due to a race between smmu\ndriver probe and client driver probe, when of_dma_configure()\nfor client is called after the iommu_device_register() for smmu driver\nprobe has executed but before the driver_bound() for smmu driver\nhas been called.\n\nFollowing is how the race occurs:\n\nT1:Smmu device probe\t\tT2: Client device probe\n\nreally_probe()\narm_smmu_device_probe()\niommu_device_register()\n\t\t\t\t\treally_probe()\n\t\t\t\t\tplatform_dma_configure()\n\t\t\t\t\tof_dma_configure()\n\t\t\t\t\tof_dma_configure_id()\n\t\t\t\t\tof_iommu_configure()\n\t\t\t\t\tiommu_probe_device()\n\t\t\t\t\tiommu_init_device()\n\t\t\t\t\tarm_smmu_probe_device()\n\t\t\t\t\tarm_smmu_get_by_fwnode()\n\t\t\t\t\t\tdriver_find_device_by_fwnode()\n\t\t\t\t\t\tdriver_find_device()\n\t\t\t\t\t\tnext_device()\n\t\t\t\t\t\tklist_next()\n\t\t\t\t\t\t    /* null ptr\n\t\t\t\t\t\t       assigned to smmu */\n\t\t\t\t\t/* null ptr dereference\n\t\t\t\t\t   while smmu->streamid_mask */\ndriver_bound()\n\tklist_add_tail()\n\nWhen this null smmu pointer is dereferenced later in\narm_smmu_probe_device, the device crashes.\n\nFix this by deferring the probe of the client device\nuntil the smmu device has bound to the arm smmu driver.\n\n[will: Add comment]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "021bb8420d44cf56102d44fca9af628625e75482",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c2527d07c7e9cda2c6165d5edccf74752baac1b0"
            },
            {
              "version": "021bb8420d44cf56102d44fca9af628625e75482",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dc02407ea952e20c544a078a6be2e6f008327973"
            },
            {
              "version": "021bb8420d44cf56102d44fca9af628625e75482",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5"
            },
            {
              "version": "021bb8420d44cf56102d44fca9af628625e75482",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4a9485918a042e3114890dfbe19839a1897f8b2c"
            },
            {
              "version": "021bb8420d44cf56102d44fca9af628625e75482",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8"
            },
            {
              "version": "021bb8420d44cf56102d44fca9af628625e75482",
              "status": "affected",
              "versionType": "git",
              "lessThan": "229e6ee43d2a160a1592b83aad620d6027084aad"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.9",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.9"
            },
            {
              "version": "5.10.231",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.174",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.120",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.66",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.13",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}