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CVE-2025-39871

Estado: ModificadaAlta (7.8)—

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

dmaengine: idxd: Remove improper idxd_free

The idxd_unregister_devices() which is invoked at the very beginning of idxd_remove(), already takes care of the necessary put_device() through the following call path: idxd_unregister_devices() -> device_unregister() -> put_device()

In addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may trigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is called immediately after, it can result in a use-after-free.

Remove the improper idxd_free() to avoid both the refcount underflow and potential memory corruption during module unload.

Detalles técnicos trazas, registros y código del informe original
The call to idxd_free() introduces a duplicate put_device() leading to a
reference count underflow:
refcount_t: underflow; use-after-free.
WARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110
...
Call Trace:
 <TASK>
  idxd_remove+0xe4/0x120 [idxd]
  pci_device_remove+0x3f/0xb0
  device_release_driver_internal+0x197/0x200
  driver_detach+0x48/0x90
  bus_remove_driver+0x74/0xf0
  pci_unregister_driver+0x2e/0xb0
  idxd_exit_module+0x34/0x7a0 [idxd]
  __do_sys_delete_module.constprop.0+0x183/0x280
  do_syscall_64+0x54/0xd70
  entry_SYSCALL_64_after_hwframe+0x76/0x7e

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad CWE-416 (use-after-free) en controlador del kernel con PR:L permite escalada local. El doble put_device() causa corrupción de memoria durante descarga del módulo, permitiendo ejecución arbitraria.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Remove improper idxd_free\n\nThe call to idxd_free() introduces a duplicate put_device() leading to a\nreference count underflow:\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110\n...\nCall Trace:\n <TASK>\n  idxd_remove+0xe4/0x120 [idxd]\n  pci_device_remove+0x3f/0xb0\n  device_release_driver_internal+0x197/0x200\n  driver_detach+0x48/0x90\n  bus_remove_driver+0x74/0xf0\n  pci_unregister_driver+0x2e/0xb0\n  idxd_exit_module+0x34/0x7a0 [idxd]\n  __do_sys_delete_module.constprop.0+0x183/0x280\n  do_syscall_64+0x54/0xd70\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe idxd_unregister_devices() which is invoked at the very beginning of\nidxd_remove(), already takes care of the necessary put_device() through the\nfollowing call path:\nidxd_unregister_devices() -> device_unregister() -> put_device()\n\nIn addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may\ntrigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is\ncalled immediately after, it can result in a use-after-free.\n\nRemove the improper idxd_free() to avoid both the refcount underflow and\npotential memory corruption during module unload."
    }
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