Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:ax25: fix use-after-free bugs caused by ax25_ds_del_timerWhen the ax25 device is detaching, the ax25_dev_device_down()calls ax25_ds_del_timer() to cleanup the slave_timer. Whenthe timer handler is running, the ax25_ds_del_timer() thatcalls del_timer() in it will return directly. As a result,the use-after-free bugs could happen, one of the scenariosis shown below: (Thread 1) | (Thread 2) | ax25_ds_timeout()ax25_dev_device_down() | ax25_ds_del_timer() | del_timer() | ax25_dev_put() //FREE | | ax25_dev-> //USEIn order to mitigate bugs, when the device is detaching, usetimer_shutdown_sync() to stop the timer.
No PoCs from references.
- https://github.com/bygregonline/devsec-fastapi-report