CVE-2023-52837

Updated on 21 May 2024

Severity

7.8 High severity

Details

CVSS score
7.8
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Overview

About vulnerability

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.

Details

Affected product:
AlmaLinux 9.2 ESU
Affected packages:
kernel @ 5.14.0-11 (+1 more)

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.

Fixes