Use-after-free in Linux kernel block driver

1) Use-after-free

EUVDB-ID: #VU90080

Risk: Low

CVSSv3.1: 7.7 [AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-52837

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the nbd_dev_remove(), nbd_release() and IS_ENABLED() functions in drivers/block/nbd.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

External links

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

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.