{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-71079",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-71079"
  ],
  "published": "2026-01-13T15:35:54Z",
  "summary": "net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write\n\nA deadlock can occur between nfc_unregister_device() and rfkill_fop_write()\ndue to lock ordering inversion between device_lock and rfkill_global_mutex.\n\nThe problematic lock order is:\n\nThread A (rfkill_fop_write):\n  rfkill_fop_write()\n    mutex_lock(&rfkill_global_mutex)\n      rfkill_set_block()\n        nfc_rfkill_set_block()\n          nfc_dev_down()\n            device_lock(&dev->dev)    <- waits for device_lock\n\nThread B (nfc_unregister_device):\n  nfc_unregister_device()\n    device_lock(&dev->dev)\n      rfkill_unregister()\n        mutex_lock(&rfkill_global_mutex)  <- waits for rfkill_global_mutex\n\nThis creates a classic ABBA deadlock scenario.\n\nFix this by moving rfkill_unregister() and rfkill_destroy() outside the\ndevice_lock critical section. Store the rfkill pointer in a local variable\nbefore releasing the lock, then call rfkill_unregister() after releasing\ndevice_lock.\n\nThis change is safe because rfkill_fop_write() holds rfkill_global_mutex\nwhile calling the rfkill callbacks, and rfkill_unregister() also acquires\nrfkill_global_mutex before cleanup. Therefore, rfkill_unregister() will\nwait for any ongoing callback to complete before proceeding, and\ndevice_del() is only called after rfkill_unregister() returns, preventing\nany use-after-free.\n\nThe similar lock ordering in nfc_register_device() (device_lock ->\nrfkill_global_mutex via rfkill_register) is safe because during\nregistration the device is not yet in rfkill_list, so no concurrent\nrfkill operations can occur on this device.",
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