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CVE-2025-71225

Estado: AnalizadaMedia (5.3)—

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

md: suspend array while updating raid_disks via sysfs

In raid1_reshape(), freeze_array() is called before modifying the r1bio memory pool (conf->r1bio_pool) and conf->raid_disks, and unfreeze_array() is called after the update is completed.

However, freeze_array() only waits until nr_sync_pending and (nr_pending - nr_queued) of all buckets reaches zero. When an I/O error occurs, nr_queued is increased and the corresponding r1bio is queued to either retry_list or bio_end_io_list. As a result, freeze_array() may unblock before these r1bios are released.

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This can lead to a situation where conf->raid_disks and the mempool have already been updated while queued r1bios, allocated with the old raid_disks value, are later released. Consequently, free_r1bio() may access memory out of bounds in put_all_bios() and release r1bios of the wrong size to the new mempool, potentially causing issues with the mempool as well.

Since only normal I/O might increase nr_queued while an I/O error occurs, suspending the array avoids this issue.

Note: Updating raid_disks via ioctl SET_ARRAY_INFO already suspends the array. Therefore, we suspend the array when updating raid_disks via sysfs to avoid this issue too.

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-2025-71225",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: suspend array while updating raid_disks via sysfs\n\nIn raid1_reshape(), freeze_array() is called before modifying the r1bio\nmemory pool (conf->r1bio_pool) and conf->raid_disks, and\nunfreeze_array() is called after the update is completed.\n\nHowever, freeze_array() only waits until nr_sync_pending and\n(nr_pending - nr_queued) of all buckets reaches zero. When an I/O error\noccurs, nr_queued is increased and the corresponding r1bio is queued to\neither retry_list or bio_end_io_list. As a result, freeze_array() may\nunblock before these r1bios are released.\n\nThis can lead to a situation where conf->raid_disks and the mempool have\nalready been updated while queued r1bios, allocated with the old\nraid_disks value, are later released. Consequently, free_r1bio() may\naccess memory out of bounds in put_all_bios() and release r1bios of the\nwrong size to the new mempool, potentially causing issues with the\nmempool as well.\n\nSince only normal I/O might increase nr_queued while an I/O error occurs,\nsuspending the array avoids this issue.\n\nNote: Updating raid_disks via ioctl SET_ARRAY_INFO already suspends\nthe array. Therefore, we suspend the array when updating raid_disks\nvia sysfs to avoid this issue too."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmd: suspender el array mientras se actualiza raid_disks a través de sysfs\n\nEn raid1_reshape(), se llama a freeze_array() antes de modificar el pool de memoria r1bio (conf->r1bio_pool) y conf->raid_disks, y se llama a unfreeze_array() después de que se completa la actualización.\n\nSin embargo, freeze_array() solo espera hasta que nr_sync_pending y (nr_pending - nr_queued) de todos los buckets lleguen a cero. Cuando ocurre un error de E/S, nr_queued se incrementa y el r1bio correspondiente se encola en retry_list o bio_end_io_list. Como resultado, freeze_array() puede desbloquearse antes de que estos r1bios sean liberados.\n\nEsto puede llevar a una situación en la que conf->raid_disks y el mempool ya han sido actualizados mientras que los r1bios encolados, asignados con el valor antiguo de raid_disks, son liberados posteriormente. En consecuencia, free_r1bio() puede acceder a memoria fuera de los límites en put_all_bios() y liberar r1bios de tamaño incorrecto al nuevo mempool, lo que podría causar problemas también con el mempool.\n\nDado que solo la E/S normal podría aumentar nr_queued mientras ocurre un error de E/S, suspender el array evita este problema.\n\nNota: La actualización de raid_disks a través de ioctl SET_ARRAY_INFO ya suspende el array. Por lo tanto, suspendemos el array al actualizar raid_disks a través de sysfs para evitar este problema también."
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