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CVE-2020-27777

MEDIUM
6.7
CVSS Score
Published: December 15, 2020 at 04:57 PM UTC
Updated: June 17, 2026 at 03:09 AM UTC
4 products affected across 2 vendorsLinux KernelEnterprise LinuxOpenShift Container Platform

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Severity
MEDIUM6.7
Exploit prediction
EPSS 0.5%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
v < 4.14.2044.15 ≤ v < 4.19.1554.20 ≤ v < 5.4.755.5 ≤ v < 5.9.5
Affected range stops below 4.14.204, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.19.155, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.75, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.9.5, so it looks safe — our inference, not a vendor statement
Enterprise Linux· Red Hatrpm
95%
5.06.07.08.0
OpenShift Container Platform· Red Hatcontainer
95%
4.44.54.6
Kernel· Red Hat
60%
5.10-rc1

References (4)

x_refsource_MISCIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1900844
x_refsource_MISCExploitPatchVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764
x_refsource_MISCExploitMailing ListPatchThird Party Advisory
Source: [email protected]
https://www.openwall.com/lists/oss-security/2020/10/09/1
x_refsource_MISCMailing ListThird Party Advisory
Source: [email protected]
https://www.openwall.com/lists/oss-security/2020/11/23/2

CVSS

6.7MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-862

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