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CVE-2024-26685

Status: AnalyzedMedium (5.5)—

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

nilfs2: fix potential bug in end_buffer_async_write

According to a syzbot report, end_buffer_async_write(), which handles the completion of block device writes, may detect abnormal condition of the buffer async_write flag and cause a BUG_ON failure when using nilfs2.

Nilfs2 itself does not use end_buffer_async_write(). But, the async_write flag is now used as a marker by commit 7f42ec394156 ("nilfs2: fix issue with race condition of competition between segments for dirty blocks") as a means of resolving double list insertion of dirty blocks in nilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the resulting crash.

Read full descriptionShow less

This modification is safe as long as it is used for file data and b-tree node blocks where the page caches are independent. However, it was irrelevant and redundant to also introduce async_write for segment summary and super root blocks that share buffers with the backing device. This led to the possibility that the BUG_ON check in end_buffer_async_write would fail as described above, if independent writebacks of the backing device occurred in parallel.

The use of async_write for segment summary buffers has already been removed in a previous change.

Fix this issue by removing the manipulation of the async_write flag for the remaining super root block buffer.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Debian — Debian LinuxLinux — Linux Kernel

CWEs

References

Raw JSON (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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