CVE-2024-35887
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/74204bf9050f7627aead9875fe4e07ba125cb19bPatch
- https://git.kernel.org/stable/c/c6a368f9c7af4c14b14d390c2543af8001c9bdb9Patch
- https://git.kernel.org/stable/c/fd819ad3ecf6f3c232a06b27423ce9ed8c20da89Patch
- https://git.kernel.org/stable/c/74204bf9050f7627aead9875fe4e07ba125cb19bPatch
- https://git.kernel.org/stable/c/c6a368f9c7af4c14b14d390c2543af8001c9bdb9Patch
- https://git.kernel.org/stable/c/fd819ad3ecf6f3c232a06b27423ce9ed8c20da89Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.