7.8

CVE-2023-52837

nbd: fix uaf in nbd_open

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.14 < 6.1.63
Linux ≫ Linux Kernel Version >= 6.2 < 6.5.12
Linux ≫ Linux Kernel Version >= 6.6 < 6.6.2
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.25% 0.158
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/327462725b0f759f093788dfbcb2f1fd132f956b
Patch
https://git.kernel.org/stable/c/4e9b3ec84dc97909876641dad14e0a2300d6c2a3
Patch
https://git.kernel.org/stable/c/56bd7901b5e9dbc9112036ea615ebcba1565fafe
Patch
https://git.kernel.org/stable/c/879947f4180bc6e83af64eb0515e0cf57fce15db
Patch