CVE-2021-21781

2021-08-1800:00:00

ubuntu.com

3.3 Low

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

2.1 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

0.0004 Low

EPSS

Percentile

14.3%

JSON

An information disclosure vulnerability exists in the ARM SIGPAGE
functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version
(5.11-rc4) seems to still be vulnerable. A userland application can read
the contents of the sigpage, which can leak kernel memory contents. An
attacker can read a process’s memory at a specific offset to trigger this
vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99
5.10.17 5.11

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-143.147UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-71.79UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1102.109UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1043.45UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1043.45~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1102.109~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1044.46UNKNOWN
ubuntu14.04noarchlinux-azure< 4.15.0-1114.127~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchlinux-azure< 4.15.0-1114.127~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu18.04noarchlinux-azure-4.15< 4.15.0-1114.127UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	linux	< 4.15.0-143.147	UNKNOWN
ubuntu	20.04	noarch	linux	< 5.4.0-71.79	UNKNOWN
ubuntu	18.04	noarch	linux-aws	< 4.15.0-1102.109	UNKNOWN
ubuntu	20.04	noarch	linux-aws	< 5.4.0-1043.45	UNKNOWN
ubuntu	18.04	noarch	linux-aws-5.4	< 5.4.0-1043.45~18.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-aws-hwe	< 4.15.0-1102.109~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	20.04	noarch	linux-azure	< 5.4.0-1044.46	UNKNOWN
ubuntu	14.04	noarch	linux-azure	< 4.15.0-1114.127~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	linux-azure	< 4.15.0-1114.127~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	18.04	noarch	linux-azure-4.15	< 4.15.0-1114.127	UNKNOWN