Vulnerability CVE-2024-36012
Published: 2024-05-23

Description:
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

 References:
https://git.kernel.org/stable/c/e3880b531b68f98d3941d83f2f6dd11cf4fd6b76
https://git.kernel.org/stable/c/a85a60e62355e3bf4802dead7938966824b23940
https://git.kernel.org/stable/c/4f1de02de07748da80a8178879bc7a1df37fdf56
https://git.kernel.org/stable/c/10f9f426ac6e752c8d87bf4346930ba347aaabac
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