Information disclosure in Linux kernel phone

1) Information disclosure

EUVDB-ID: #VU61579

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-45095

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a refcount leak within the pep_sock_accept() function in net/phonet/pep.c in the Linux kernel. A local user can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.15.9

External links

http://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=bcd0f93353326954817a4f9fa55ec57fb38acbb0
http://github.com/torvalds/linux/commit/bcd0f93353326954817a4f9fa55ec57fb38acbb0
http://www.debian.org/security/2022/dsa-5050
http://www.debian.org/security/2022/dsa-5096
http://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
http://lists.debian.org/debian-lts-announce/2022/03/msg00011.html

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.