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Vulnerability CVE-2024-35887
Published: 2024-05-19
| Description: |
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. |
References: |
https://git.kernel.org/stable/c/74204bf9050f7627aead9875fe4e07ba125cb19b
https://git.kernel.org/stable/c/c6a368f9c7af4c14b14d390c2543af8001c9bdb9
https://git.kernel.org/stable/c/fd819ad3ecf6f3c232a06b27423ce9ed8c20da89
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