Is CVE-2020-27777 in the CISA KEV catalog?

No. CVE-2020-27777 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27777?

CVE-2020-27777 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2020-27777?

CVE-2020-27777 has an EPSS score of 0.50% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27777?

Upgrade linux on debian 11 to 5.9.6-1 or later. Fixes are available for 104 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27777

MEDIUM

6.7

CVSS v3

NVD

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.

CWE-862Missing Authorization

How to fix

Remediation Available

linuxDebian

Fixed in:5.9.6-1CVE-2020-27777

linuxUbuntu

Fixed in:4.4.0-201.233USN-4708-1

Fixed in:4.15.0-129.132USN-4680-1

Fixed in:5.4.0-59.65USN-4679-1

linux-awsUbuntu

Fixed in:4.15.0-1091.96USN-4680-1

Fixed in:5.4.0-1034.35USN-4679-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1034.35~18.04.1USN-4679-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1091.96~16.04.1USN-4680-1

linux-azureUbuntu

Fixed in:4.15.0-1103.114~14.04.1USN-4680-1

Fixed in:4.15.0-1103.114~16.04.1USN-4680-1

Fixed in:5.4.0-1035.36USN-4679-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1103.114USN-4680-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1035.36~18.04.1USN-4679-1

linux-gcpUbuntu

Fixed in:4.15.0-1091.104~16.04.1USN-4680-1

Fixed in:5.4.0-1033.35USN-4679-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1091.104USN-4680-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1033.35~18.04.1USN-4679-1

linux-gke-4.15Ubuntu

Fixed in:4.15.0-1077.82USN-4680-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1033.35~18.04.1USN-4679-1

linux-hweUbuntu

Fixed in:4.15.0-129.132~16.04.1USN-4680-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-59.65~18.04.1USN-4679-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-44.50~20.04.1USN-4751-1

linux-image-4.15.0-1062-oracleUbuntu

Fixed in:4.15.0-1062.68~16.04.1USN-4680-1

Fixed in:4.15.0-1062.68USN-4680-1

linux-image-4.15.0-1077-gkeUbuntu

Fixed in:4.15.0-1077.82USN-4680-1

linux-image-4.15.0-1077-raspi2Ubuntu

Fixed in:4.15.0-1077.82USN-4680-1

linux-image-4.15.0-1082-kvmUbuntu

Fixed in:4.15.0-1082.84USN-4680-1

linux-image-4.15.0-1091-awsUbuntu

Fixed in:4.15.0-1091.96~16.04.1USN-4680-1

Fixed in:4.15.0-1091.96USN-4680-1

linux-image-4.15.0-1091-gcpUbuntu

Fixed in:4.15.0-1091.104~16.04.1USN-4680-1

Fixed in:4.15.0-1091.104USN-4680-1

linux-image-4.15.0-1094-snapdragonUbuntu

Fixed in:4.15.0-1094.103USN-4680-1

linux-image-4.15.0-1103-azureUbuntu

Fixed in:4.15.0-1103.114~14.04.1USN-4680-1

Fixed in:4.15.0-1103.114~16.04.1USN-4680-1

Fixed in:4.15.0-1103.114USN-4680-1

linux-image-4.15.0-129-genericUbuntu

Fixed in:4.15.0-129.132~16.04.1USN-4680-1

Fixed in:4.15.0-129.132USN-4680-1

linux-image-4.15.0-129-generic-lpaeUbuntu

Fixed in:4.15.0-129.132~16.04.1USN-4680-1

Fixed in:4.15.0-129.132USN-4680-1

linux-image-4.15.0-129-lowlatencyUbuntu

Fixed in:4.15.0-129.132~16.04.1USN-4680-1

Fixed in:4.15.0-129.132USN-4680-1

linux-image-4.4.0-201-genericUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

Fixed in:4.4.0-201.233USN-4708-1

linux-image-4.4.0-201-generic-lpaeUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

Fixed in:4.4.0-201.233USN-4708-1

linux-image-4.4.0-201-lowlatencyUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

Fixed in:4.4.0-201.233USN-4708-1

linux-image-4.4.0-201-powerpc-e500mcUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

Fixed in:4.4.0-201.233USN-4708-1

linux-image-4.4.0-201-powerpc-smpUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

Fixed in:4.4.0-201.233USN-4708-1

linux-image-4.4.0-201-powerpc64-embUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

Fixed in:4.4.0-201.233USN-4708-1

linux-image-4.4.0-201-powerpc64-smpUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

Fixed in:4.4.0-201.233USN-4708-1

linux-image-5.4.0-1026-raspiUbuntu

Fixed in:5.4.0-1026.29~18.04.1USN-4679-1

Fixed in:5.4.0-1026.29USN-4679-1

linux-image-5.4.0-1031-kvmUbuntu

Fixed in:5.4.0-1031.32USN-4679-1

linux-image-5.4.0-1033-gcpUbuntu

Fixed in:5.4.0-1033.35~18.04.1USN-4679-1

Fixed in:5.4.0-1033.35USN-4679-1

linux-image-5.4.0-1033-gkeUbuntu

Fixed in:5.4.0-1033.35~18.04.1USN-4679-1

linux-image-5.4.0-1034-awsUbuntu

Fixed in:5.4.0-1034.35~18.04.1USN-4679-1

Fixed in:5.4.0-1034.35USN-4679-1

linux-image-5.4.0-1034-oracleUbuntu

Fixed in:5.4.0-1034.36~18.04.1USN-4679-1

Fixed in:5.4.0-1034.36USN-4679-1

linux-image-5.4.0-1035-azureUbuntu

Fixed in:5.4.0-1035.36~18.04.1USN-4679-1

Fixed in:5.4.0-1035.36USN-4679-1

linux-image-5.4.0-59-genericUbuntu

Fixed in:5.4.0-59.65~18.04.1USN-4679-1

Fixed in:5.4.0-59.65USN-4679-1

linux-image-5.4.0-59-generic-lpaeUbuntu

Fixed in:5.4.0-59.65~18.04.1USN-4679-1

Fixed in:5.4.0-59.65USN-4679-1

linux-image-5.4.0-59-lowlatencyUbuntu

Fixed in:5.4.0-59.65~18.04.1USN-4679-1

Fixed in:5.4.0-59.65USN-4679-1

linux-image-5.8.0-44-genericUbuntu

Fixed in:5.8.0-44.50~20.04.1USN-4751-1

linux-image-5.8.0-44-generic-lpaeUbuntu

Fixed in:5.8.0-44.50~20.04.1USN-4751-1

linux-image-5.8.0-44-lowlatencyUbuntu

Fixed in:5.8.0-44.50~20.04.1USN-4751-1

linux-image-awsUbuntu

Fixed in:5.4.0.1034.19USN-4679-1

Fixed in:5.4.0.1034.35USN-4679-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1091.85USN-4680-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1091.93USN-4680-1

linux-image-azureUbuntu

Fixed in:4.15.0.1103.78USN-4680-1

Fixed in:4.15.0.1103.96USN-4680-1

Fixed in:5.4.0.1035.17USN-4679-1

Fixed in:5.4.0.1035.33USN-4679-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1103.76USN-4680-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1091.92USN-4680-1

Fixed in:5.4.0.1033.21USN-4679-1

Fixed in:5.4.0.1033.42USN-4679-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1091.109USN-4680-1

linux-image-genericUbuntu

Fixed in:4.4.0.201.207USN-4708-1

Fixed in:4.15.0.129.116USN-4680-1

Fixed in:5.4.0.59.62USN-4679-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.129.128USN-4680-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.59.65~18.04.54USN-4679-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-generic-lpaeUbuntu

Fixed in:4.4.0.201.207USN-4708-1

Fixed in:4.15.0.129.116USN-4680-1

Fixed in:5.4.0.59.62USN-4679-1

linux-image-generic-lpae-hwe-16.04Ubuntu

Fixed in:4.15.0.129.128USN-4680-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.59.65~18.04.54USN-4679-1

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-generic-lpae-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1091.92USN-4680-1

Fixed in:4.15.0.1077.81USN-4680-1

linux-image-gke-4.15Ubuntu

Fixed in:4.15.0.1077.81USN-4680-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1033.35~18.04.2USN-4679-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1082.78USN-4680-1

Fixed in:5.4.0.1031.29USN-4679-1

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.201.207USN-4708-1

Fixed in:4.15.0.129.116USN-4680-1

Fixed in:5.4.0.59.62USN-4679-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.129.128USN-4680-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.59.65~18.04.54USN-4679-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-image-oemUbuntu

Fixed in:4.15.0.129.128USN-4680-1

Fixed in:5.4.0.59.65~18.04.54USN-4679-1

Fixed in:5.4.0.59.62USN-4679-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.59.65~18.04.54USN-4679-1

Fixed in:5.4.0.59.62USN-4679-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1062.51USN-4680-1

Fixed in:5.4.0.1034.36~18.04.18USN-4679-1

Fixed in:5.4.0.1034.31USN-4679-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1062.72USN-4680-1

linux-image-powerpc-e500mcUbuntu

Fixed in:4.4.0.201.207USN-4708-1

linux-image-powerpc-e500mc-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-image-powerpc-smpUbuntu

Fixed in:4.4.0.201.207USN-4708-1

linux-image-powerpc-smp-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-image-powerpc64-embUbuntu

Fixed in:4.4.0.201.207USN-4708-1

linux-image-powerpc64-emb-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-image-powerpc64-smpUbuntu

Fixed in:4.4.0.201.207USN-4708-1

linux-image-powerpc64-smp-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1026.61USN-4679-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1026.30USN-4679-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1077.74USN-4680-1

Fixed in:5.4.0.1026.61USN-4679-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1094.97USN-4680-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.59.65~18.04.54USN-4679-1

linux-image-virtualUbuntu

Fixed in:4.4.0.201.207USN-4708-1

Fixed in:4.15.0.129.116USN-4680-1

Fixed in:5.4.0.59.62USN-4679-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.129.128USN-4680-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.59.65~18.04.54USN-4679-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.201.176USN-4708-1

linux-kvmUbuntu

Fixed in:4.15.0-1082.84USN-4680-1

Fixed in:5.4.0-1031.32USN-4679-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-201.233~14.04.1USN-4708-1

linux-oracleUbuntu

Fixed in:4.15.0-1062.68~16.04.1USN-4680-1

Fixed in:4.15.0-1062.68USN-4680-1

Fixed in:5.4.0-1034.36USN-4679-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1034.36~18.04.1USN-4679-1

linux-raspiUbuntu

Fixed in:5.4.0-1026.29USN-4679-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1026.29~18.04.1USN-4679-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1077.82USN-4680-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1094.103USN-4680-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.50%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Patch3

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-862 (Missing Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-39226	Critical	9.8	100%	KEV	Fix
CVE-2022-0543	Critical	10.0	100%	KEV	Fix
CVE-2021-21978	Critical	9.8	99%	-	Fix
CVE-2023-52163	High	8.8	96%	KEV	-
CVE-2022-1329	High	8.8	93%	-	-
CVE-2023-6875	Critical	9.8	90%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.