CVE-2021-33656

2022-07-1800:00:00

ubuntu.com

6.8 Medium

CVSS3

Attack Vector

PHYSICAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

0.001 Low

EPSS

Percentile

32.6%

JSON

When setting font with malicous data by ioctl cmd PIO_FONT,kernel will
write memory out of bounds.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-192.203UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-125.141UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-234.268UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1140.151UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1084.91UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1113.119UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1150.165UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1084.91~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1140.151~16.04.1UNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1090.95UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-192.203	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-125.141	UNKNOWN
ubuntu	16.04	noarch	linux	< 4.4.0-234.268	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1140.151	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1084.91	UNKNOWN
ubuntu	14.04	noarch	linux-aws	< 4.4.0-1113.119	UNKNOWN
ubuntu	16.04	noarch	linux-aws	< 4.4.0-1150.165	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1084.91~18.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-aws-hwe	< 4.15.0-1140.151~16.04.1	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1090.95	UNKNOWN