Vulnerability CVE-2023-52837
Published: 2024-05-21

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

nbd: fix uaf in nbd_open

Commit 4af5f2e03013 ("nbd: use blk_mq_alloc_disk and
blk_cleanup_disk") cleans up disk by blk_cleanup_disk() and it won't set
disk->private_data as NULL as before. UAF may be triggered in nbd_open()
if someone tries to open nbd device right after nbd_put() since nbd has
been free in nbd_dev_remove().

Fix this by implementing ->free_disk and free private data in it.

 References:
https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3
https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db
https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe
https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b
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