#VU89936 Memory leak in Linux kernel - CVE-2021-47442

Vulnerability identifier: #VU89936

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-2021-47442

CWE-ID: CWE-401

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 memory leak within the digital_in_send_sdd_req() function in net/nfc/digital_technology.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/74569c78aa84f8c958f1334b465bc530906ec99a
https://git.kernel.org/stable/c/88c890b0b9a1fb9fcd01c61ada515e8b636c34f9
https://git.kernel.org/stable/c/fcce6e5255474ca33c27dda0cdf9bf5087278873
https://git.kernel.org/stable/c/071bdef36391958c89af5fa2172f691b31baa212
https://git.kernel.org/stable/c/2bde4aca56db9fe25405d39ddb062531493a65db
https://git.kernel.org/stable/c/50cb95487c265187289810addec5093d4fed8329
https://git.kernel.org/stable/c/6432d7f1d1c3aa74cfe8f5e3afdf81b786c32e86
https://git.kernel.org/stable/c/291c932fc3692e4d211a445ba8aa35663831bac7

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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.