Null pointer dereference in Linux kernel en rep driver

1) Null pointer dereference

EUVDB-ID: #VU92393

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/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-2021-47164

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to null pointer dereference error within the mlx5e_rep_changelowerstate_event() function in drivers/net/ethernet/mellanox/mlx5/core/en/rep/bond.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's repository.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

External links

http://git.kernel.org/stable/c/2e4b0b95a489259f9d35a3db17023061f8f3d587
http://git.kernel.org/stable/c/bdfd3593a8248eea6ecfcbf7b47b56b86515672d
http://git.kernel.org/stable/c/83026d83186bc48bb41ee4872f339b83f31dfc55

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.