firmware: qcom: scm: Fix NULL dereference in IRQ handler before __scm is published

{
  "id": "1077dc8eb3be1a51da40258e1912e4828b07324a80b39dee7a3ce0c30355c16e",
  "url": "https://osv.dev/vulnerability/CVE-2026-90397",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "firmware: qcom: scm: Fix NULL dereference in IRQ handler before __scm is published",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: scm: Fix NULL dereference in IRQ handler before __scm is published In qcom_scm_probe(), devm_request_threaded_irq() is called before smp_store_release(&__scm, scm). Two paths can dereference __scm before it is published, both causing a NULL pointer dereference. The IRQ handler receives scm via its data argument but passes only wq_ctx to qcom_scm_waitq_wakeup() and qcom_scm_get_completion(), which then dereference __scm directly. Thread scm through both functions so the IRQ handler path never touches __scm. Non-atomic SMC calls made during probe (e.g. from qcom_tzmem_init via qcom_scm_shm_bridge_enable) can return WAITQ_SLEEP, causing qcom_scm_wait_for_wq_completion() to run before __scm is published and dereference it. Add platform_set_drvdata(pdev, scm) early in probe and change qcom_scm_wait_for_wq_completion() to take the device pointer and use dev_get_drvdata() to reach scm, removing any dependency on __scm.",
    "evidence": "osv:CVE-2026-90397",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90397",
      "aliases": [
        "CVE-2026-90397"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "6bf32599223634294cdc6efb359ffaab1d68073c"
                },
                {
                  "fixed": "c9c1e3da0a206270e5df470ca1c82de52190d68c"
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                {
                  "fixed": "b451f38cb7f5bca78484362347f039c08c94de95"
                },
                {
                  "fixed": "1d753df5899ec356272d08bc4718e82844e4bdf0"
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                {
                  "fixed": "f312ef5026678f14caf1378c5f7fffdf667f9c81"
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                {
                  "fixed": "966d23c7e68ea32679275a7e3d2383181002c868"
                }
              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90397.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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                  "fixed": "6.12.110"
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.52"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.6"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90397.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.652748822Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1d753df5899ec356272d08bc4718e82844e4bdf0",
        "https://git.kernel.org/stable/c/966d23c7e68ea32679275a7e3d2383181002c868",
        "https://git.kernel.org/stable/c/b451f38cb7f5bca78484362347f039c08c94de95",
        "https://git.kernel.org/stable/c/c9c1e3da0a206270e5df470ca1c82de52190d68c",
        "https://git.kernel.org/stable/c/f312ef5026678f14caf1378c5f7fffdf667f9c81",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90397.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90397",
        "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/2026/90xxx/CVE-2026-90397.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90397",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499752,
  "published_at": "2026-09-17T16:09:28.967+00:00"
}