CVE-2020-14331

2020-09-1500:00:00

ubuntu.com

linux kernel

local attacker

vga console

out-of-bounds write

crash

privilege escalation

data confidentiality

data integrity

system availability

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

6.6

Attack Vector

PHYSICAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

Percentile

5.1%

JSON

A flaw was found in the Linux kernel’s implementation of the invert video
code on VGA consoles when a local attacker attempts to resize the console,
calling an ioctl VT_RESIZE, which causes an out-of-bounds write to occur.
This flaw allows a local user with access to the VGA console to crash the
system, potentially escalating their privileges on the system. The highest
threat from this vulnerability is to data confidentiality and integrity as
well as system availability.

Notes

Author	Note
alexmurray	CONFIG_VGACON_SOFT_SCROLLBACK is required to be enabled for this to be exploitable. This config option is disabled in Ubuntu kernel configs.