Memory leak in Linux kernel mlx5 core driver

1) Memory leak

EUVDB-ID: #VU89935

Risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47438

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the mlx5_core_destroy_cq() function in drivers/net/ethernet/mellanox/mlx5/core/cq.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

External links

http://git.kernel.org/stable/c/4f7bddf8c5c01cac74373443b13a68e1c6723a94
http://git.kernel.org/stable/c/ed8aafea4fec9c654e63445236e0b505e27ed3a7
http://git.kernel.org/stable/c/94b960b9deffc02fc0747afc01f72cc62ab099e3

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.