Use-after-free in Linux kernel

1) Use-after-free

EUVDB-ID: #VU28414

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8649

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local authenticated user to #BASIC_IMPACT#.

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the vgacon_invert_region function in drivers/video/console/vgacon.c.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 5.5.19

External links

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.216
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.216
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.109
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.173
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.9
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.25
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.