Vulnerability identifier: #VU93174

Vulnerability 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-2021-47265

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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

The vulnerability exists due to improper input validation within the mlx5_ib_create_flow() function in drivers/infiniband/hw/mlx5/fs.c, within the mlx4_ib_create_flow() function in drivers/infiniband/hw/mlx4/main.c, within the ib_uverbs_ex_create_flow() function in drivers/infiniband/core/uverbs_cmd.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://git.kernel.org/stable/c/8dc1b0e0ca204596c50bcd159ee069ae0f998176
http://git.kernel.org/stable/c/2adcb4c5a52a2623cd2b43efa7041e74d19f3a5e

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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.