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CVE-2026-53234

Estado: AnalizadaAlta (7.8)—

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

net: ibm: emac: Fix use-after-free during device removal

The driver was using devm_register_netdev() which causes unregister_netdev() to be deferred until the devres cleanup phase, which runs after emac_remove() returns. This creates a use-after-free window where:

1. emac_remove() is called, which tears down hardware (cancels work, detaches modules, unregisters from MAL) 2. emac_remove() returns 3. devres cleanup runs and finally calls unregister_netdev()

During step 3, the network stack might still process packets, triggering emac_irq(), emac_poll(), or other handlers that access now-freed hardware resources (dev->emacp, dev->mal, etc.).

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Fix this by replacing devm_register_netdev() with manual register_netdev() and calling unregister_netdev() at the beginning of emac_remove(), before any hardware teardown. This ensures the network device is fully stopped and unregistered before hardware resources are released.

The change is safe because: - dev->ndev is assigned very early in probe (before any error paths that could bypass emac_remove) - platform_set_drvdata() is only called after successful registration, so emac_remove() only runs for fully registered devices - unregister_netdev() is idempotent and safe to call on any registered device

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 de use-after-free (CWE-416) en kernel Linux con AV:L/PR:L. El atacante local ejecuta código mediante handlers del dispositivo (emac_irq, emac_poll) accediendo a memoria liberada tras escalada de privilegios.

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

Threat Intelligence ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ibm: emac: Fix use-after-free during device removal\n\nThe driver was using devm_register_netdev() which causes unregister_netdev()\nto be deferred until the devres cleanup phase, which runs after emac_remove()\nreturns. This creates a use-after-free window where:\n\n1. emac_remove() is called, which tears down hardware (cancels work, detaches\n   modules, unregisters from MAL)\n2. emac_remove() returns\n3. devres cleanup runs and finally calls unregister_netdev()\n\nDuring step 3, the network stack might still process packets, triggering\nemac_irq(), emac_poll(), or other handlers that access now-freed hardware\nresources (dev->emacp, dev->mal, etc.).\n\nFix this by replacing devm_register_netdev() with manual register_netdev()\nand calling unregister_netdev() at the beginning of emac_remove(), before\nany hardware teardown. This ensures the network device is fully stopped and\nunregistered before hardware resources are released.\n\nThe change is safe because:\n- dev->ndev is assigned very early in probe (before any error paths that\n  could bypass emac_remove)\n- platform_set_drvdata() is only called after successful registration, so\n  emac_remove() only runs for fully registered devices\n- unregister_netdev() is idempotent and safe to call on any registered device"
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  "lastModified": "2026-07-08T19:02:06.450",
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