Improper locking in Linux kernel hw mlx5 driver



| Updated: 2025-05-13
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-47615
CWE-ID CWE-667
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper locking

EUVDB-ID: #VU92357

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47615

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

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

The vulnerability exists due to improper locking within the mlx5_ib_dereg_mr(), mlx5_ib_alloc_pi_mr() and __mlx5_ib_alloc_mr() functions in drivers/infiniband/hw/mlx5/mr.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.15 - 5.16 rc8

CPE2.3 External links

https://git.kernel.org/stable/c/e3bc4d4b50cae7db08e50dbe43f771c906e97701
https://git.kernel.org/stable/c/c44979ace49b4aede3cc7cb5542316e53a4005c9
https://git.kernel.org/stable/c/f0ae4afe3d35e67db042c58a52909e06262b740f
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.10
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.14
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16


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.



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