CVE-2024-26846

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvme-fc: no espere en vano al descargar el módulo. La ruta de salida del módulo tiene una carrera entre eliminar todos los controladores y liberar los 'ID sobrantes'. Para evitar la doble liberación, la confirmación inicial agregó una sincronización entre nvme_delete_ctrl e ida_destroy. Existe cierta lógica al tratar de evitar que se cuelgue para siempre en wait_for_completion, aunque no maneja todos los casos. Por ejemplo, blktests puede reproducir la situación en la que la descarga del módulo se bloquea para siempre. Si confiamos completamente en el código de limpieza ejecutado desde la ruta nvme_delete_ctrl, eventualmente se liberarán todas las ID. Esto hace que llamar a ida_destroy sea innecesario. Solo tenemos que asegurarnos de que todo el código nvme_delete_ctrl se haya ejecutado antes de salir de nvme_fc_exit_module. Esto se hace vaciando la cola de trabajo nvme_delete_wq. Mientras lo hace, elimine también la cola de trabajo nvme_fc_wq no utilizada.

In the Linux kernel, the following vulnerability has been resolved: nvme-fc: do not wait in vain when unloading module The module exit path has race between deleting all controllers and freeing 'left over IDs'. To prevent double free a synchronization between nvme_delete_ctrl and ida_destroy has been added by the initial commit. There is some logic around trying to prevent from hanging forever in wait_for_completion, though it does not handling all cases. E.g. blktests is able to reproduce the situation where the module unload hangs forever. If we completely rely on the cleanup code executed from the nvme_delete_ctrl path, all IDs will be freed eventually. This makes calling ida_destroy unnecessary. We only have to ensure that all nvme_delete_ctrl code has been executed before we leave nvme_fc_exit_module. This is done by flushing the nvme_delete_wq workqueue. While at it, remove the unused nvme_fc_wq workqueue too.

Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service. It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code.