firmware_loader: Fix recursive lock in device_cache_fw_images()

{
  "id": "b4e354ea92986f95431096045f183b9cdfa1ed2043562411cea87d043536aa0f",
  "url": "https://osv.dev/vulnerability/CVE-2026-74331",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "firmware_loader: Fix recursive lock in device_cache_fw_images()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: firmware_loader: Fix recursive lock in device_cache_fw_images() A recursive locking deadlock can occur in the firmware loader's power management notification handler. During system suspend or hibernation preparation, fw_pm_notify() calls device_cache_fw_images(). This function acquires fw_lock to set the firmware cache state to FW_LOADER_START_CACHE and then iterates over all devices using dpm_for_each_dev() while still holding the lock. For each device, dev_cache_fw_image() schedules asynchronous work to cache the firmware. If memory allocation for the async work entry fails (e.g., in out-of-memory conditions), async_schedule_node_domain() falls back to executing the work function synchronously in the current thread. The synchronous execution path (__async_dev_cache_fw_image() -> cache_firmware() -> request_firmware() -> assign_fw()) attempts to acquire fw_lock again. Since the current thread already holds fw_lock, this results in a recursive locking deadlock. Fix this by releasing fw_lock immediately after updating the cache state and before calling dpm_for_each_dev(). The lock is only needed to protect the state update. Concurrent firmware requests will correctly see the FW_LOADER_START_CACHE state and use the piggyback mechanism, which is independently protected by its own fwc->name_lock.",
    "evidence": "osv:CVE-2026-74331",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
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        "affected_versions": []
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    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-74331",
      "aliases": [
        "CVE-2026-74331"
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      ],
      "modified": "2026-10-28T02:30:42.846438605Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63",
        "https://git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b",
        "https://git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3",
        "https://git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774",
        "https://git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7",
        "https://git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8",
        "https://git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103",
        "https://git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74331.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74331",
        "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/2026/74xxx/CVE-2026-74331.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74331",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510665,
  "published_at": "2026-08-15T05:58:24.42+00:00"
}