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CVE-2024-26685

Estado: AnalizadaMedia (5.5)—

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: corrige un posible error en end_buffer_async_write Según un informe de syzbot, end_buffer_async_write(), que maneja la finalización de las escrituras del dispositivo de bloque, puede detectar una condición anormal del indicador async_write del búfer y causar un Error BUG_ON al usar nilfs2. Nilfs2 en sí no usa end_buffer_async_write().

Leer descripción completaMostrar menos

Pero el indicador async_write ahora se usa como marcador en el commit 7f42ec394156 ("nilfs2: soluciona el problema con la condición de ejecución de competencia entre segmentos por bloques sucios") como un medio para resolver la inserción de lista doble de bloques sucios en nilfs_lookup_dirty_data_buffers() y nilfs_lookup_node_buffers( ) y el accidente resultante. Esta modificación es segura siempre que se utilice para datos de archivos y bloques de nodos de árbol b donde las cachés de páginas sean independientes. Sin embargo, era irrelevante y redundante introducir también async_write para el resumen de segmento y los bloques súper raíz que comparten buffers con el dispositivo de respaldo. Esto generó la posibilidad de que la verificación BUG_ON en end_buffer_async_write fallara como se describe anteriormente, si se produjeran reescrituras independientes del dispositivo de respaldo en paralelo. El uso de async_write para buffers de resumen de segmentos ya se eliminó en un cambio anterior. Solucione este problema eliminando la manipulación del indicador async_write para el búfer de bloque súper raíz restante.

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 (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential bug in end_buffer_async_write\n\nAccording to a syzbot report, end_buffer_async_write(), which handles the\ncompletion of block device writes, may detect abnormal condition of the\nbuffer async_write flag and cause a BUG_ON failure when using nilfs2.\n\nNilfs2 itself does not use end_buffer_async_write().  But, the async_write\nflag is now used as a marker by commit 7f42ec394156 (\"nilfs2: fix issue\nwith race condition of competition between segments for dirty blocks\") as\na means of resolving double list insertion of dirty blocks in\nnilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the\nresulting crash.\n\nThis modification is safe as long as it is used for file data and b-tree\nnode blocks where the page caches are independent.  However, it was\nirrelevant and redundant to also introduce async_write for segment summary\nand super root blocks that share buffers with the backing device.  This\nled to the possibility that the BUG_ON check in end_buffer_async_write\nwould fail as described above, if independent writebacks of the backing\ndevice occurred in parallel.\n\nThe use of async_write for segment summary buffers has already been\nremoved in a previous change.\n\nFix this issue by removing the manipulation of the async_write flag for\nthe remaining super root block buffer."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: corrige un posible error en end_buffer_async_write Según un informe de syzbot, end_buffer_async_write(), que maneja la finalización de las escrituras del dispositivo de bloque, puede detectar una condición anormal del indicador async_write del búfer y causar un Error BUG_ON al usar nilfs2. Nilfs2 en sí no usa end_buffer_async_write(). Pero el indicador async_write ahora se usa como marcador en el commit 7f42ec394156 (\"nilfs2: soluciona el problema con la condición de ejecución de competencia entre segmentos por bloques sucios\") como un medio para resolver la inserción de lista doble de bloques sucios en nilfs_lookup_dirty_data_buffers() y nilfs_lookup_node_buffers( ) y el accidente resultante. Esta modificación es segura siempre que se utilice para datos de archivos y bloques de nodos de árbol b donde las cachés de páginas sean independientes. Sin embargo, era irrelevante y redundante introducir también async_write para el resumen de segmento y los bloques súper raíz que comparten buffers con el dispositivo de respaldo. Esto generó la posibilidad de que la verificación BUG_ON en end_buffer_async_write fallara como se describe anteriormente, si se produjeran reescrituras independientes del dispositivo de respaldo en paralelo. El uso de async_write para buffers de resumen de segmentos ya se eliminó en un cambio anterior. Solucione este problema eliminando la manipulación del indicador async_write para el búfer de bloque súper raíz restante."
    }
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  "lastModified": "2026-06-17T07:18:05.510",
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