Vulnerability identifier: #VU96620

Vulnerability 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-2021-4442

CWE-ID: CWE-399

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 resource management error within the do_tcp_setsockopt() function in net/ipv4/tcp.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/319f460237fc2965a80aa9a055044e1da7b3692a
http://git.kernel.org/stable/c/3bf899438c123c444f6b644a57784dfbb6b15ad6
http://git.kernel.org/stable/c/046f3c1c2ff450fb7ae53650e9a95e0074a61f3e
http://git.kernel.org/stable/c/3b72d5a703842f582502d97906f17d6ee122dac2
http://git.kernel.org/stable/c/8811f4a9836e31c14ecdf79d9f3cb7c5d463265d

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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.