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

ax25: fix use-after-free bugs caused by ax25_ds_del_timer

When the ax25 device is detaching, the ax25_dev_device_down()
calls ax25_ds_del_timer() to cleanup the slave_timer. When
the timer handler is running, the ax25_ds_del_timer() that
calls del_timer() in it will return directly. As a result,
the use-after-free bugs could happen, one of the scenarios
is 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-> //USE

In order to mitigate bugs, when the device is detaching, use
timer_shutdown_sync() to stop the timer.

kernel.org https://git.kernel.org/stable/c/74204bf9050f7627aead9875fe4e07ba125cb19b [No types assigned]

kernel.org https://git.kernel.org/stable/c/c6a368f9c7af4c14b14d390c2543af8001c9bdb9 [No types assigned]

kernel.org https://git.kernel.org/stable/c/fd819ad3ecf6f3c232a06b27423ce9ed8c20da89 [No types assigned]