Memory leak in Linux kernel hamradio

1) Memory leak

EUVDB-ID: #VU89947

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-2021-47237

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

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

The vulnerability exists due to memory leak within the mkiss_close() function in drivers/net/hamradio/mkiss.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

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/c634ba0b4159838ff45a60d3a0ace3b4118077a5
https://git.kernel.org/stable/c/3942d0f9ace1a95a74930b5b4fc0e5005c62b37b
https://git.kernel.org/stable/c/765a8a04f828db7222b36a42b1031f576bfe95c3
https://git.kernel.org/stable/c/c16c4716a1b5ba4f83c7e00da457cba06761f119
https://git.kernel.org/stable/c/a49cbb762ef20655f5c91abdc13658b0af5e159d
https://git.kernel.org/stable/c/290b0b6432e2599021db0b8d6046f756d931c29f
https://git.kernel.org/stable/c/f4de2b43d13b7cf3ced9310e371b90c836dbd7cd
https://git.kernel.org/stable/c/7edcc682301492380fbdd604b4516af5ae667a13

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.