CVE-2023-52837: nbd: fix uaf in nbd_open
First published: Tue May 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.63 | 6.1.63 |
| redhat/kernel | <6.5.12 | 6.5.12 |
| redhat/kernel | <6.6.2 | 6.6.2 |
| redhat/kernel | <6.7 | 6.7 |
| Linux Kernel | >=5.14<6.1.63 | |
| Linux Kernel | >=6.2<6.5.12 | |
| Linux Kernel | >=6.6<6.6.2 |
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Reference Links
- https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b
- https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3
- https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe
- https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db
- https://access.redhat.com/security/cve/CVE-2023-52837
- https://lore.kernel.org/linux-cve-announce/2024052110-CVE-2023-52837-6490@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2282637
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