CVE-2025-71225
Full vulnerability record from the local CVENow database.
Description
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. 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.
Severity
MEDIUM
CVSS score
5.3
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-02-18 15:18:40.330000
Last modified
2026-10-21 13:18:25.643000
View original CVE JSON
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-02-18T15:18:40.330",
"lastModified": "2026-10-21T13:18:25.643",
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{
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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."
},
{
"lang": "es",
"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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