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ubuntucveUbuntu.comUB:CVE-2020-27777
HistoryDec 15, 2020 - 12:00 a.m.

CVE-2020-27777

2020-12-1500:00:00
ubuntu.com
ubuntu.com
35

6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.2 High

CVSS2

Access Vector

LOCAL

Access 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

0.0004 Low

EPSS

Percentile

5.3%

JSON

A flaw was found in the way RTAS handled memory accesses in userspace to
kernel communication. On a locked down (usually due to Secure Boot) guest
system running on top of PowerVM or KVM hypervisors (pseries platform) a
root like local user could use this flaw to further increase their
privileges to that of a running kernel.

Notes

Author Note
sbeattie fix needs typo correction from lkml link in refs
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-129.132UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-59.65UNKNOWN
ubuntu20.10noarchlinux< 5.8.0-44.50UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-201.233UNKNOWN
ubuntu18.04noarchlinux-dell300x< 4.15.0-1010.14UNKNOWN
ubuntu18.04noarchlinux-gke-5.4< 5.4.0-1033.35~18.04.1UNKNOWN
ubuntu18.04noarchlinux-gkeop-5.4< 5.4.0-1008.9~18.04.1UNKNOWN
ubuntu16.04noarchlinux-hwe< 4.15.0-129.132~16.04.1UNKNOWN
ubuntu18.04noarchlinux-hwe-5.4< 5.4.0-59.65~18.04.1UNKNOWN
ubuntu20.04noarchlinux-hwe-5.8< 5.8.0-44.50~20.04.1UNKNOWN
Rows per page:
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6.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7.2 High

CVSS2

Access Vector

LOCAL

Access 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

0.0004 Low

EPSS

Percentile

5.3%

JSON
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