CVE-2023-52837: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.14, before 6.1.63 (fixed in 6.1.63); from 6.2, before 6.5.12 (fixed in 6.5.12); from 6.6, before 6.6.2 (fixed in 6.6.2)

Published 2024-05-21. Last modified 2026-08-04.