In the Linux kernel, the following vulnerability has been resolved:
wifi: libertas_tf: fix use-after-free in lbtf_free_adapter()
lbtf_free_adapter() calls timer_delete(&priv->command_timer), which does not wait for a running command_timer_fn() callback. lbtf_free_adapter() runs on the teardown path right before ieee80211_free_hw() frees priv, both in lbtf_remove_card() and in the probe error path. command_timer is armed by mod_timer() in lbtf_cmd() whenever a firmware command is sent. command_timer_fn() dereferences priv. If a command times out as the device is removed, command_timer_fn() runs concurrently with teardown and dereferences priv after it has been freed.
This is the same use-after-free that commit 03cc8f90d053 (wifi: libertas: fix use-after-free in lbs_free_adapter()) fixed in the sibling libertas driver. The libertas_tf variant has the identical pattern and was left unchanged. Use timer_delete_sync() so any in-flight callback completes before priv is freed.
References
- https://git.kernel.org/stable/c/066b59e84f90d270cc15f0370166155aca507630
- https://git.kernel.org/stable/c/4714e95f5d61cb9c5c7c6c4e68b618f37bc6ffcf
- https://git.kernel.org/stable/c/aa6dcd5c8dd9ba1d7d0f60093bcda41c0d6d438d
- https://git.kernel.org/stable/c/bcf7968cb97ce4312588042cf2712f04caff6d8f
- https://git.kernel.org/stable/c/fcff712d0e3d183843ec3916470ee6cc3455baad