Home/CVE/A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually
CVE

CVE-2020-27777

A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually

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.

MEDIUM · CVSS 6.7 EPSS 0.00027
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-862Missing Authorization
▤

Affected Products & Versions

6
linux kernel< 4.14.204
linux kernel>= 4.15 and < 4.19.155
linux kernel>= 4.20 and < 5.4.75
linux kernel>= 5.5 and < 5.9.5
redhat openshift container platformall versions
redhat enterprise linuxall versions
⚠

Public Exploits & PoCs

1
pocgit.kernel.org · ?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764git.kernel.org
▣

Scoring & Timeline

6.7
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD15 Dec 2020 · 05:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

30
rhsaRHSA-2021:4356Low
rhsaRHSA-2021:3327Important
usnUSN-4751-1
suse-csafSUSE-SU-2021:14630-1
suse-csafSUSE-SU-2021:0452-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1900844Issue TrackingPatchThird Party Advisory
https://www.openwall.com/lists/oss-security/2020/10/09/1ExploitMailing ListPatchThird Party Advisory
https://www.openwall.com/lists/oss-security/2020/11/23/2Mailing ListThird Party Advisory
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