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CVE-2022-49446

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

nvdimm: Fix firmware activation deadlock scenarios

Lockdep reports the following deadlock scenarios for CXL root device power-management, device_prepare(), operations, and device_shutdown() operations for 'nd_region' devices:

These stem from holding nvdimm_bus_lock() over hibernate_quiet_exec() which walks the entire system device topology taking device_lock() along the way. The nvdimm_bus_lock() is protecting against unregistration, multiple simultaneous ops callers, and preventing activate_show() from racing activate_store().

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For the first 2, the lock is redundant. Unregistration already flushes all ops users, and sysfs already prevents multiple threads to be active in an ops handler at the same time. For the last userspace should already be waiting for its last activate_store() to complete, and does not need activate_show() to flush the write side, so this lock usage can be deleted in these attributes.

Detalles técnicos trazas, registros y código del informe original
 Chain exists of:
   &nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(system_transition_mutex);
                                lock(&nvdimm_bus->reconfig_mutex);
                                lock(system_transition_mutex);
   lock(&nvdimm_region_key);

 Chain exists of:
   &cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(&cxl_root_key);
                                lock(acpi_scan_lock);
                                lock(&cxl_root_key);
   lock(&cxl_nvdimm_bridge_key);

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2022-49446",
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          "options": [
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              "automatable": "no"
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          "version": "2.0.3",
          "timestamp": "2025-10-01T19:40:46.179643Z"
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          "integrityImpact": "NONE",
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          "confidentialityImpact": "NONE"
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  "published": "2025-02-26T07:01:21.010",
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvdimm: Fix firmware activation deadlock scenarios\n\nLockdep reports the following deadlock scenarios for CXL root device\npower-management, device_prepare(), operations, and device_shutdown()\noperations for 'nd_region' devices:\n\n Chain exists of:\n   &nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex\n\n  Possible unsafe locking scenario:\n\n        CPU0                    CPU1\n        ----                    ----\n   lock(system_transition_mutex);\n                                lock(&nvdimm_bus->reconfig_mutex);\n                                lock(system_transition_mutex);\n   lock(&nvdimm_region_key);\n\n Chain exists of:\n   &cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key\n\n  Possible unsafe locking scenario:\n\n        CPU0                    CPU1\n        ----                    ----\n   lock(&cxl_root_key);\n                                lock(acpi_scan_lock);\n                                lock(&cxl_root_key);\n   lock(&cxl_nvdimm_bridge_key);\n\nThese stem from holding nvdimm_bus_lock() over hibernate_quiet_exec()\nwhich walks the entire system device topology taking device_lock() along\nthe way. The nvdimm_bus_lock() is protecting against unregistration,\nmultiple simultaneous ops callers, and preventing activate_show() from\nracing activate_store(). For the first 2, the lock is redundant.\nUnregistration already flushes all ops users, and sysfs already prevents\nmultiple threads to be active in an ops handler at the same time. For\nthe last userspace should already be waiting for its last\nactivate_store() to complete, and does not need activate_show() to flush\nthe write side, so this lock usage can be deleted in these attributes."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvdimm: Se corrigen los escenarios de bloqueo de activación de firmware Lockdep informa los siguientes escenarios de bloqueo para la administración de energía del dispositivo raíz CXL, device_prepare(), operaciones y operaciones device_shutdown() para dispositivos 'nd_region': Existe una cadena de: &nvdimm_region_key --> &nvdimm_bus->reconfig_mutex --> system_transition_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(system_transition_mutex); lock(&nvdimm_bus->reconfig_mutex); lock(system_transition_mutex); lock(&nvdimm_region_key); Chain exists of: &cxl_nvdimm_bridge_key --> acpi_scan_lock --> &cxl_root_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cxl_root_key); lock(acpi_scan_lock); lock(&cxl_root_key); lock(&cxl_nvdimm_bridge_key); Estos se derivan de mantener nvdimm_bus_lock() sobre hibernate_quiet_exec() que recorre toda la topología del dispositivo del sistema tomando device_lock() en el camino. nvdimm_bus_lock() protege contra la anulación del registro, múltiples invocadores de operaciones simultáneas y evita que activate_show() compita con activate_store(). Para los primeros 2, el bloqueo es redundante. La anulación del registro ya borra todos los usuarios de operaciones, y sysfs ya evita que varios subprocesos estén activos en un controlador de operaciones al mismo tiempo. Para el último espacio de usuario ya debería estar esperando a que se complete su último activate_store(), y no necesita activate_show() para borrar el lado de escritura, por lo que este uso de bloqueo se puede eliminar en estos atributos."
    }
  ],
  "lastModified": "2026-06-17T05:18:04.410",
  "configurations": [
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