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

Bluetooth: msft: fix slab-use-after-free in msft_do_close()

Tying the msft->data lifetime to hdev by freeing it in
hci_release_dev() to fix the following case:

[use]
msft_do_close()
  msft = hdev->msft_data;
  if (!msft)                      ...(1) <- passed.
    return;
  mutex_lock(&msft->filter_lock); ...(4) <- used after freed.

[free]
msft_unregister()
  msft = hdev->msft_data;
  hdev->msft_data = NULL;         ...(2)
  kfree(msft);                    ...(3) <- msft is freed.

==================================================================
BUG: KASAN: slab-use-after-free in __mutex_lock_common
kernel/locking/mutex.c:587 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0x8f/0xc30
kernel/locking/mutex.c:752
Read of size 8 at addr ffff888106cbbca8 by task kworker/u5:2/309

kernel.org https://git.kernel.org/stable/c/10f9f426ac6e752c8d87bf4346930ba347aaabac [No types assigned]

kernel.org https://git.kernel.org/stable/c/4f1de02de07748da80a8178879bc7a1df37fdf56 [No types assigned]

kernel.org https://git.kernel.org/stable/c/a85a60e62355e3bf4802dead7938966824b23940 [No types assigned]

kernel.org https://git.kernel.org/stable/c/e3880b531b68f98d3941d83f2f6dd11cf4fd6b76 [No types assigned]