Is CVE-2020-27830 in the CISA KEV catalog?

No. CVE-2020-27830 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27830?

CVE-2020-27830 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2020-27830?

CVE-2020-27830 has an EPSS score of 0.30% (22th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27830?

Upgrade linux on debian 11 to 5.9.15-1 or later. Fixes are available for 95 affected products.

CVE & CISA-KEV Catalog

CVE-2020-27830

MEDIUM

5.5

CVSS v3

NVD

Description

A vulnerability was found in Linux Kernel where in the spk_ttyio_receive_buf2() function, it would dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref crash.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

linuxDebian

Fixed in:5.9.15-1CVE-2020-27830

linuxUbuntu

Fixed in:4.15.0-136.140USN-4749-1

Fixed in:5.4.0-66.74USN-4750-1

linux-awsUbuntu

Fixed in:4.15.0-1094.101USN-4749-1

Fixed in:5.4.0-1038.40USN-4750-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1038.40~18.04.1USN-4750-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1094.101~16.04.1USN-4749-1

linux-azureUbuntu

Fixed in:4.15.0-1108.120~14.04.1USN-4749-1

Fixed in:4.15.0-1108.120~16.04.1USN-4749-1

Fixed in:5.4.0-1040.42USN-4750-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1108.120USN-4749-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1040.42~18.04.1USN-4750-1

linux-dell300xUbuntu

Fixed in:4.15.0-1012.16USN-4749-1

linux-gcpUbuntu

Fixed in:4.15.0-1093.106~16.04.1USN-4749-1

Fixed in:5.4.0-1037.40USN-4750-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1093.106USN-4749-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1037.40~18.04.1USN-4750-1

linux-gke-4.15Ubuntu

Fixed in:4.15.0-1079.84USN-4749-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1036.38~18.04.1USN-4750-1

linux-gkeopUbuntu

Fixed in:5.4.0-1010.11USN-4750-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1010.11~18.04.1USN-4750-1

linux-hweUbuntu

Fixed in:4.15.0-136.140~16.04.1USN-4749-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-66.74~18.04.2USN-4750-1

linux-hwe-5.8Ubuntu

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

linux-image-4.15.0-1012-dell300xUbuntu

Fixed in:4.15.0-1012.16USN-4749-1

linux-image-4.15.0-1065-oracleUbuntu

Fixed in:4.15.0-1065.73~16.04.1USN-4749-1

Fixed in:4.15.0-1065.73USN-4749-1

linux-image-4.15.0-1079-gkeUbuntu

Fixed in:4.15.0-1079.84USN-4749-1

linux-image-4.15.0-1079-raspi2Ubuntu

Fixed in:4.15.0-1079.84USN-4749-1

linux-image-4.15.0-1085-kvmUbuntu

Fixed in:4.15.0-1085.87USN-4749-1

linux-image-4.15.0-1093-gcpUbuntu

Fixed in:4.15.0-1093.106~16.04.1USN-4749-1

Fixed in:4.15.0-1093.106USN-4749-1

linux-image-4.15.0-1094-awsUbuntu

Fixed in:4.15.0-1094.101~16.04.1USN-4749-1

Fixed in:4.15.0-1094.101USN-4749-1

linux-image-4.15.0-1096-snapdragonUbuntu

Fixed in:4.15.0-1096.105USN-4749-1

linux-image-4.15.0-1108-azureUbuntu

Fixed in:4.15.0-1108.120~14.04.1USN-4749-1

Fixed in:4.15.0-1108.120~16.04.1USN-4749-1

Fixed in:4.15.0-1108.120USN-4749-1

linux-image-4.15.0-136-genericUbuntu

Fixed in:4.15.0-136.140~16.04.1USN-4749-1

Fixed in:4.15.0-136.140USN-4749-1

linux-image-4.15.0-136-generic-lpaeUbuntu

Fixed in:4.15.0-136.140~16.04.1USN-4749-1

Fixed in:4.15.0-136.140USN-4749-1

linux-image-4.15.0-136-lowlatencyUbuntu

Fixed in:4.15.0-136.140~16.04.1USN-4749-1

Fixed in:4.15.0-136.140USN-4749-1

linux-image-5.4.0-1010-gkeopUbuntu

Fixed in:5.4.0-1010.11~18.04.1USN-4750-1

Fixed in:5.4.0-1010.11USN-4750-1

linux-image-5.4.0-1029-raspiUbuntu

Fixed in:5.4.0-1029.32~18.04.1USN-4750-1

Fixed in:5.4.0-1029.32USN-4750-1

linux-image-5.4.0-1033-kvmUbuntu

Fixed in:5.4.0-1033.34USN-4750-1

linux-image-5.4.0-1036-gkeUbuntu

Fixed in:5.4.0-1036.38~18.04.1USN-4750-1

linux-image-5.4.0-1037-gcpUbuntu

Fixed in:5.4.0-1037.40~18.04.1USN-4750-1

Fixed in:5.4.0-1037.40USN-4750-1

linux-image-5.4.0-1038-awsUbuntu

Fixed in:5.4.0-1038.40~18.04.1USN-4750-1

Fixed in:5.4.0-1038.40USN-4750-1

linux-image-5.4.0-1038-oracleUbuntu

Fixed in:5.4.0-1038.41~18.04.1USN-4750-1

Fixed in:5.4.0-1038.41USN-4750-1

linux-image-5.4.0-1040-azureUbuntu

Fixed in:5.4.0-1040.42~18.04.1USN-4750-1

Fixed in:5.4.0-1040.42USN-4750-1

linux-image-5.4.0-66-genericUbuntu

Fixed in:5.4.0-66.74~18.04.2USN-4750-1

Fixed in:5.4.0-66.74USN-4750-1

linux-image-5.4.0-66-generic-lpaeUbuntu

Fixed in:5.4.0-66.74~18.04.2USN-4750-1

Fixed in:5.4.0-66.74USN-4750-1

linux-image-5.4.0-66-lowlatencyUbuntu

Fixed in:5.4.0-66.74~18.04.2USN-4750-1

Fixed in:5.4.0-66.74USN-4750-1

linux-image-5.6.0-1053-oemUbuntu

Fixed in:5.6.0-1053.57USN-4912-1

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:5.4.0.1038.22USN-4750-1

Fixed in:5.4.0.1038.39USN-4750-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1094.87USN-4749-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1094.97USN-4749-1

linux-image-azureUbuntu

Fixed in:4.15.0.1108.81USN-4749-1

Fixed in:4.15.0.1108.99USN-4749-1

Fixed in:5.4.0.1040.20USN-4750-1

Fixed in:5.4.0.1040.38USN-4750-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1108.81USN-4749-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1012.14USN-4749-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1093.94USN-4749-1

Fixed in:5.4.0.1037.24USN-4750-1

Fixed in:5.4.0.1037.46USN-4750-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1093.111USN-4749-1

linux-image-genericUbuntu

Fixed in:4.15.0.136.123USN-4749-1

Fixed in:5.4.0.66.69USN-4750-1

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:4.15.0.136.132USN-4749-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.66.74~18.04.61USN-4750-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.136.123USN-4749-1

Fixed in:5.4.0.66.69USN-4750-1

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

Fixed in:4.15.0.136.132USN-4749-1

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

Fixed in:5.4.0.66.74~18.04.61USN-4750-1

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

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1093.94USN-4749-1

Fixed in:4.15.0.1079.83USN-4749-1

linux-image-gke-4.15Ubuntu

Fixed in:4.15.0.1079.83USN-4749-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1036.38~18.04.4USN-4750-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1010.13USN-4750-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1010.11~18.04.11USN-4750-1

Fixed in:5.4.0.1010.13USN-4750-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1085.81USN-4749-1

Fixed in:5.4.0.1033.31USN-4750-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.136.123USN-4749-1

Fixed in:5.4.0.66.69USN-4750-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.136.132USN-4749-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.66.74~18.04.61USN-4750-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-image-oemUbuntu

Fixed in:4.15.0.136.132USN-4749-1

Fixed in:5.4.0.66.74~18.04.61USN-4750-1

Fixed in:5.4.0.66.69USN-4750-1

linux-image-oem-20.04Ubuntu

Fixed in:5.6.0.1053.49USN-4912-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.66.74~18.04.61USN-4750-1

Fixed in:5.4.0.66.69USN-4750-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1065.53USN-4749-1

Fixed in:5.4.0.1038.41~18.04.21USN-4750-1

Fixed in:5.4.0.1038.35USN-4750-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1065.75USN-4749-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1029.64USN-4750-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1029.32USN-4750-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1079.76USN-4749-1

Fixed in:5.4.0.1029.64USN-4750-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1096.99USN-4749-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.66.74~18.04.61USN-4750-1

linux-image-virtualUbuntu

Fixed in:4.15.0.136.123USN-4749-1

Fixed in:5.4.0.66.69USN-4750-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.136.132USN-4749-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.66.74~18.04.61USN-4750-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.44.50~20.04.30USN-4751-1

linux-kvmUbuntu

Fixed in:4.15.0-1085.87USN-4749-1

Fixed in:5.4.0-1033.34USN-4750-1

linux-oem-5.6Ubuntu

Fixed in:5.6.0-1053.57USN-4912-1

linux-oracleUbuntu

Fixed in:4.15.0-1065.73~16.04.1USN-4749-1

Fixed in:4.15.0-1065.73USN-4749-1

Fixed in:5.4.0-1038.41USN-4750-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1038.41~18.04.1USN-4750-1

linux-raspiUbuntu

Fixed in:5.4.0-1029.32USN-4750-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1029.32~18.04.1USN-4750-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1079.84USN-4749-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1096.105USN-4749-1

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.30%probability of exploitation in 30 days

22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory5

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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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.