Is CVE-2020-27171 in the CISA KEV catalog?

No. CVE-2020-27171 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27171?

CVE-2020-27171 has a CVSS v3 base score of 6.0 (MEDIUM).

What is the EPSS score for CVE-2020-27171?

CVE-2020-27171 has an EPSS score of 0.58% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27171?

Upgrade linux on debian 11 to 5.10.24-1 or later. Fixes are available for 105 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27171

MEDIUM

6.0

CVSS v3

NVD

Description

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-10d2bb2e6b1d.

CWE-193

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.24-1CVE-2020-27171

linuxUbuntu

Fixed in:4.15.0-140.144USN-4890-1

Fixed in:5.4.0-70.78USN-4887-1

linux-awsUbuntu

Fixed in:4.15.0-1097.104USN-4890-1

Fixed in:5.4.0-1041.43USN-4887-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1041.43~18.04.1USN-4887-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1097.104~16.04.1USN-4890-1

linux-azureUbuntu

Fixed in:4.15.0-1111.123~14.04.1USN-4890-1

Fixed in:4.15.0-1111.123~16.04.1USN-4890-1

Fixed in:5.4.0-1043.45USN-4887-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1111.123USN-4890-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4887-1

linux-dell300xUbuntu

Fixed in:4.15.0-1015.19USN-4890-1

linux-gcpUbuntu

Fixed in:4.15.0-1096.109~16.04.1USN-4890-1

Fixed in:5.4.0-1040.43USN-4887-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1096.109USN-4890-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1040.43~18.04.1USN-4887-1

linux-gke-5.3Ubuntu

Fixed in:5.3.0-1041.44USN-4887-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1039.41~18.04.1USN-4887-1

linux-gkeopUbuntu

Fixed in:5.4.0-1012.13USN-4887-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1012.13~18.04.1USN-4887-1

linux-hweUbuntu

Fixed in:4.15.0-140.144~16.04.1USN-4890-1

Fixed in:5.3.0-72.68USN-4887-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-4.15.0-1015-dell300xUbuntu

Fixed in:4.15.0-1015.19USN-4890-1

linux-image-4.15.0-1068-oracleUbuntu

Fixed in:4.15.0-1068.76~16.04.1USN-4890-1

Fixed in:4.15.0-1068.76USN-4890-1

linux-image-4.15.0-1082-raspi2Ubuntu

Fixed in:4.15.0-1082.87USN-4890-1

linux-image-4.15.0-1088-kvmUbuntu

Fixed in:4.15.0-1088.90USN-4890-1

linux-image-4.15.0-1096-gcpUbuntu

Fixed in:4.15.0-1096.109~16.04.1USN-4890-1

Fixed in:4.15.0-1096.109USN-4890-1

linux-image-4.15.0-1097-awsUbuntu

Fixed in:4.15.0-1097.104~16.04.1USN-4890-1

Fixed in:4.15.0-1097.104USN-4890-1

linux-image-4.15.0-1099-snapdragonUbuntu

Fixed in:4.15.0-1099.108USN-4890-1

linux-image-4.15.0-1111-azureUbuntu

Fixed in:4.15.0-1111.123~14.04.1USN-4890-1

Fixed in:4.15.0-1111.123~16.04.1USN-4890-1

Fixed in:4.15.0-1111.123USN-4890-1

linux-image-4.15.0-140-genericUbuntu

Fixed in:4.15.0-140.144~16.04.1USN-4890-1

Fixed in:4.15.0-140.144USN-4890-1

linux-image-4.15.0-140-generic-lpaeUbuntu

Fixed in:4.15.0-140.144~16.04.1USN-4890-1

Fixed in:4.15.0-140.144USN-4890-1

linux-image-4.15.0-140-lowlatencyUbuntu

Fixed in:4.15.0-140.144~16.04.1USN-4890-1

Fixed in:4.15.0-140.144USN-4890-1

linux-image-5.10.0-1019-oemUbuntu

Fixed in:5.10.0-1019.20USN-4887-1

linux-image-5.3.0-1038-raspi2Ubuntu

Fixed in:5.3.0-1038.40USN-4887-1

linux-image-5.3.0-1041-gkeUbuntu

Fixed in:5.3.0-1041.44USN-4887-1

linux-image-5.3.0-72-genericUbuntu

Fixed in:5.3.0-72.68USN-4887-1

linux-image-5.3.0-72-lowlatencyUbuntu

Fixed in:5.3.0-72.68USN-4887-1

linux-image-5.4.0-1012-gkeopUbuntu

Fixed in:5.4.0-1012.13~18.04.1USN-4887-1

Fixed in:5.4.0-1012.13USN-4887-1

linux-image-5.4.0-1032-raspiUbuntu

Fixed in:5.4.0-1032.35~18.04.1USN-4887-1

Fixed in:5.4.0-1032.35USN-4887-1

linux-image-5.4.0-1036-kvmUbuntu

Fixed in:5.4.0-1036.37USN-4887-1

linux-image-5.4.0-1039-gkeUbuntu

Fixed in:5.4.0-1039.41~18.04.1USN-4887-1

linux-image-5.4.0-1040-gcpUbuntu

Fixed in:5.4.0-1040.43~18.04.1USN-4887-1

Fixed in:5.4.0-1040.43USN-4887-1

linux-image-5.4.0-1041-awsUbuntu

Fixed in:5.4.0-1041.43~18.04.1USN-4887-1

Fixed in:5.4.0-1041.43USN-4887-1

linux-image-5.4.0-1041-oracleUbuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4887-1

Fixed in:5.4.0-1041.44USN-4887-1

linux-image-5.4.0-1043-azureUbuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4887-1

Fixed in:5.4.0-1043.45USN-4887-1

linux-image-5.4.0-70-genericUbuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

Fixed in:5.4.0-70.78USN-4887-1

linux-image-5.4.0-70-generic-lpaeUbuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

Fixed in:5.4.0-70.78USN-4887-1

linux-image-5.4.0-70-lowlatencyUbuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

Fixed in:5.4.0-70.78USN-4887-1

linux-image-5.6.0-1052-oemUbuntu

Fixed in:5.6.0-1052.56USN-4887-1

linux-image-5.8.0-48-genericUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-5.8.0-48-generic-64kUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-5.8.0-48-generic-lpaeUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-5.8.0-48-lowlatencyUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-awsUbuntu

Fixed in:5.4.0.1041.24USN-4887-1

Fixed in:5.4.0.1041.42USN-4887-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1097.90USN-4890-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1097.100USN-4890-1

linux-image-azureUbuntu

Fixed in:4.15.0.1111.84USN-4890-1

Fixed in:4.15.0.1111.102USN-4890-1

Fixed in:5.4.0.1043.23USN-4887-1

Fixed in:5.4.0.1043.41USN-4887-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1111.84USN-4890-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1015.17USN-4890-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1096.97USN-4890-1

Fixed in:5.4.0.1040.27USN-4887-1

Fixed in:5.4.0.1040.49USN-4887-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1096.114USN-4890-1

linux-image-genericUbuntu

Fixed in:4.15.0.140.127USN-4890-1

Fixed in:5.4.0.70.73USN-4887-1

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

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.140.135USN-4890-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.140.127USN-4890-1

Fixed in:5.4.0.70.73USN-4887-1

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

Fixed in:4.15.0.140.135USN-4890-1

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

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

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

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1096.97USN-4890-1

linux-image-gke-5.3Ubuntu

Fixed in:5.3.0.1041.24USN-4887-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1039.41~18.04.6USN-4887-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1012.15USN-4887-1

linux-image-gkeop-5.3Ubuntu

Fixed in:5.3.0.72.129USN-4887-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1012.13~18.04.13USN-4887-1

Fixed in:5.4.0.1012.15USN-4887-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1088.84USN-4890-1

Fixed in:5.4.0.1036.34USN-4887-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.140.127USN-4890-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.140.135USN-4890-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-oemUbuntu

Fixed in:4.15.0.140.135USN-4890-1

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-oem-20.04Ubuntu

Fixed in:5.6.0.1052.48USN-4887-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1019.20USN-4887-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1068.56USN-4890-1

Fixed in:5.4.0.1041.44~18.04.23USN-4887-1

Fixed in:5.4.0.1041.38USN-4887-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1068.78USN-4890-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1032.67USN-4887-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1032.34USN-4887-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1082.79USN-4890-1

Fixed in:5.4.0.1032.67USN-4887-1

linux-image-raspi2-hwe-18.04Ubuntu

Fixed in:5.3.0.1038.27USN-4887-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1099.102USN-4890-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-virtualUbuntu

Fixed in:4.15.0.140.127USN-4890-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.140.135USN-4890-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-kvmUbuntu

Fixed in:4.15.0-1088.90USN-4890-1

Fixed in:5.4.0-1036.37USN-4887-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1019.20USN-4887-1

linux-oem-5.6Ubuntu

Fixed in:5.6.0-1052.56USN-4887-1

linux-oracleUbuntu

Fixed in:4.15.0-1068.76~16.04.1USN-4890-1

Fixed in:4.15.0-1068.76USN-4890-1

Fixed in:5.4.0-1041.44USN-4887-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4887-1

linux-raspiUbuntu

Fixed in:5.4.0-1032.35USN-4887-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1032.35~18.04.1USN-4887-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1082.87USN-4890-1

linux-raspi2-5.3Ubuntu

Fixed in:5.3.0-1038.40USN-4887-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1099.108USN-4890-1

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

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.58%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Patch3

Third-Party Advisory3

Other references3

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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.