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.

Classification

CVE ID: CVE-2023-52837

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.08% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

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

Timeline