Vulnerability identifier: #VU51547

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25656

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor:

Description

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

The vulnerability exists due to a use-after-free error in the way the console subsystem uses KDGKBSENT and KDSKBSENT IOCTLs. A local user can run a specially crafted program to trigger an out-of-bounds read and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

---

External links
http://bugzilla.redhat.com/show_bug.cgi?id=1888726
http://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
http://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
http://lkml.org/lkml/2020/10/16/84
http://lkml.org/lkml/2020/10/29/528

---

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.