CVE-2023-52837
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.25% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956bPatch
- https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3Patch
- https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafePatch
- https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15dbPatch
- https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956bPatch
- https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3Patch
- https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafePatch
- https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15dbPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.