Memory leak in Linux kernel caif

1) Memory leak

EUVDB-ID: #VU89256

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-2021-47122

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 caif_device_notify() function in net/caif/caif_dev.c. A local user can perform a denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

External links

http://git.kernel.org/stable/c/b042e2b2039565eb8f0eb51c14fbe1ef463c8cd8
http://git.kernel.org/stable/c/9348c1f10932f13b299cbc8b1bd5f780751fae49
http://git.kernel.org/stable/c/4bca2034b41c15b62d47a19158bb76235fd4455d
http://git.kernel.org/stable/c/3be863c11cab725add9fef4237ed4e232c3fc3bb
http://git.kernel.org/stable/c/f52f4fd67264c70cd0b4ba326962ebe12d9cba94
http://git.kernel.org/stable/c/af2806345a37313f01b1c9f15e046745b8ee2daa
http://git.kernel.org/stable/c/6a0e317f61094d377335547e015dd2ff12caf893
http://git.kernel.org/stable/c/b53558a950a89824938e9811eddfc8efcd94e1bb

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.