CVE-2026-64376
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
firmware_loader: fix device reference leak in firmware_upload_register()
After fw_create_instance() succeeds, the lifetime of the embedded struct device is expected to be managed through the device core reference counting, since fw_create_instance() has already called device_initialize().
In firmware_upload_register(), if alloc_lookup_fw_priv() fails after fw_create_instance() succeeds, the code reaches free_fw_sysfs and frees fw_sysfs directly instead of releasing the device reference with put_device(). This may leave the reference count of the embedded struct device unbalanced, resulting in a refcount leak.
Leer descripción completaMostrar menos
The issue was identified by a static analysis tool I developed and confirmed by manual review. Fix this by using put_device(fw_dev) in the failure path and letting fw_dev_release() handle the final cleanup, instead of freeing the instance directly from the error path.
Detalles técnicos trazas, registros y código del informe original
firmware_upload_register()
-> fw_create_instance()
-> device_initialize()CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 5/10/2026
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)
CWE
- NVD-CWE-Other
Referencias
- https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574
- https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384
- https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe
- https://git.kernel.org/stable/c/517676ec7dfca064e08f94007a4abd21969de0a0
- https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696
- https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: fix device reference leak in firmware_upload_register()\n\nfirmware_upload_register()\n -> fw_create_instance()\n -> device_initialize()\n\nAfter fw_create_instance() succeeds, the lifetime of the embedded struct\ndevice is expected to be managed through the device core reference\ncounting, since fw_create_instance() has already called\ndevice_initialize().\n\nIn firmware_upload_register(), if alloc_lookup_fw_priv() fails after\nfw_create_instance() succeeds, the code reaches free_fw_sysfs and frees\nfw_sysfs directly instead of releasing the device reference with\nput_device(). This may leave the reference count of the embedded struct\ndevice unbalanced, resulting in a refcount leak.\n\nThe issue was identified by a static analysis tool I developed and\nconfirmed by manual review. Fix this by using put_device(fw_dev) in the\nfailure path and letting fw_dev_release() handle the final cleanup,\ninstead of freeing the instance directly from the error path."
}
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