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ubuntucveUbuntu.comUB:CVE-2021-22543
HistoryMay 26, 2021 - 12:00 a.m.

CVE-2021-22543

2021-05-2600:00:00
ubuntu.com
ubuntu.com
19

4.6 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

8.7 High

CVSS4

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/SC:H/VI:H/SI:H/VA:L/SA:L

0.0004 Low

EPSS

Percentile

5.1%

An issue was discovered in Linux: KVM through Improper handling of
VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages
being freed while still accessible by the VMM and guest. This allows users
with the ability to start and control a VM to read/write random pages of
memory and can result in local privilege escalation.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-159.167UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-84.94UNKNOWN
ubuntu21.04noarchlinux< 5.11.0-34.36UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1112.119UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1056.59UNKNOWN
ubuntu21.04noarchlinux-aws< 5.11.0-1017.18UNKNOWN
ubuntu20.04noarchlinux-aws-5.11< 5.11.0-1017.18~20.04.1UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1056.59~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1112.119~16.04.1UNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1058.60UNKNOWN
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4.6 Medium

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

8.7 High

CVSS4

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/SC:H/VI:H/SI:H/VA:L/SA:L

0.0004 Low

EPSS

Percentile

5.1%