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CVE-2025-38580

Estado: ModificadaAlta (7.8)—

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

ext4: fix inode use after free in ext4_end_io_rsv_work()

In ext4_io_end_defer_completion(), check if io_end->list_vec is empty to avoid adding an io_end that requires no conversion to the i_rsv_conversion_list, which in turn prevents starting an unnecessary worker. An ext4_emergency_state() check is also added to avoid attempting to abort the journal in an emergency state.

Additionally, ext4_put_io_end_defer() is refactored to call ext4_io_end_defer_completion() directly instead of being open-coded. This also prevents starting an unnecessary worker when EXT4_IO_END_FAILED is set but data_err=abort is not enabled.

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This ensures that the check in ext4_put_io_end_defer() is consistent with the check in ext4_end_bio(). Otherwise, we might add an io_end to the i_rsv_conversion_list and then call ext4_finish_bio(), after which the inode could be freed before ext4_end_io_rsv_work() is called, triggering a use-after-free issue.

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.

Acceso local (AV:L) sin interacción (UI:N) con privilegios limitados (PR:L) en Linux kernel. Use-after-free (CWE-416) que permite ejecución de código con privilegios elevados tras escalada local.

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)

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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: se corrige el uso de inodo use after free en ext4_end_io_rsv_work() En ext4_io_end_defer_completion(), se comprueba si io_end->list_vec está vacío para evitar añadir un io_end que no requiere conversión a i_rsv_conversion_list, lo que a su vez impide iniciar un trabajador innecesario. También se añade una comprobación ext4_emergency_state() para evitar intentar abortar el diario en un estado de emergencia. Además, ext4_put_io_end_defer() se refactoriza para llamar a ext4_io_end_defer_completion() directamente en lugar de estar en código abierto. Esto también impide iniciar un trabajador innecesario cuando EXT4_IO_END_FAILED está configurado pero data_err=abort no está habilitado. Esto garantiza que la comprobación en ext4_put_io_end_defer() sea coherente con la comprobación en ext4_end_bio(). De lo contrario, podríamos agregar un io_end a i_rsv_conversion_list y luego llamar a ext4_finish_bio(), después de lo cual el inodo podría liberarse antes de que se llame a ext4_end_io_rsv_work(), lo que desencadenaría un problema de use-after-free."
    }
  ],
  "lastModified": "2026-07-30T06:23:28.383",
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