#VU90743 Improper locking in Linux kernel - CVE-2021-47392

Vulnerability identifier: #VU90743

Vulnerability 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-2021-47392

CWE-ID: CWE-667

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 locking within the cma_cancel_route(), cma_cancel_listens() and cma_listen_on_all() functions in drivers/infiniband/core/cma.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

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External links
https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4
https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35
https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81

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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.