CVE-2021-3655

LOW

3.3

CVSS v3

Description

A vulnerability was found in the Linux kernel in versions prior to v5.14-rc1. Missing size validations on inbound SCTP packets may allow the kernel to read uninitialized memory.

CWE-909 CWE-20Improper Input Validation

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.46-3CVE-2021-3655

linuxUbuntu

Fixed in:4.15.0-162.170USN-5136-1

Fixed in:5.4.0-91.102USN-5163-1

linux-awsUbuntu

Fixed in:4.15.0-1115.122USN-5136-1

Fixed in:5.4.0-1060.63USN-5163-1

linux-aws-5.11Ubuntu

Fixed in:5.11.0-1022.23~20.04.1USN-5161-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1060.63~18.04.1USN-5163-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1115.122~16.04.1USN-5136-1

linux-azureUbuntu

Fixed in:4.15.0-1126.139~14.04.1USN-5136-1

Fixed in:4.15.0-1126.139~16.04.1USN-5136-1

Fixed in:5.4.0-1064.67USN-5163-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1126.139USN-5136-1

linux-azure-5.11Ubuntu

Fixed in:5.11.0-1022.23~20.04.1USN-5161-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1064.67~18.04.1USN-5163-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1022.25USN-5163-1

linux-dell300xUbuntu

Fixed in:4.15.0-1030.35USN-5136-1

linux-gcpUbuntu

Fixed in:4.15.0-1111.125~16.04.1USN-5136-1

Fixed in:5.4.0-1058.62USN-5163-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1111.125USN-5136-1

linux-gcp-5.11Ubuntu

Fixed in:5.11.0-1023.25~20.04.1USN-5161-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1058.62~18.04.1USN-5163-1

linux-gkeUbuntu

Fixed in:5.4.0-1056.59USN-5163-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1056.59~18.04.1USN-5163-1

linux-gkeopUbuntu

Fixed in:5.4.0-1027.28USN-5163-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1027.28~18.04.1USN-5163-1

linux-hweUbuntu

Fixed in:4.15.0-162.170~16.04.1USN-5136-1

linux-hwe-5.11Ubuntu

Fixed in:5.11.0-41.45~20.04.1USN-5161-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-91.102~18.04.1USN-5163-1

linux-ibmUbuntu

Fixed in:5.4.0-1008.9USN-5163-1

linux-image-4.15.0-1030-dell300xUbuntu

Fixed in:4.15.0-1030.35USN-5136-1

linux-image-4.15.0-1083-oracleUbuntu

Fixed in:4.15.0-1083.91~16.04.1USN-5136-1

Fixed in:4.15.0-1083.91USN-5136-1

linux-image-4.15.0-1098-raspi2Ubuntu

Fixed in:4.15.0-1098.104USN-5136-1

linux-image-4.15.0-1102-kvmUbuntu

Fixed in:4.15.0-1102.104USN-5136-1

linux-image-4.15.0-1111-gcpUbuntu

Fixed in:4.15.0-1111.125~16.04.1USN-5136-1

Fixed in:4.15.0-1111.125USN-5136-1

linux-image-4.15.0-1115-awsUbuntu

Fixed in:4.15.0-1115.122~16.04.1USN-5136-1

Fixed in:4.15.0-1115.122USN-5136-1

linux-image-4.15.0-1115-snapdragonUbuntu

Fixed in:4.15.0-1115.124USN-5136-1

linux-image-4.15.0-1126-azureUbuntu

Fixed in:4.15.0-1126.139~14.04.1USN-5136-1

Fixed in:4.15.0-1126.139~16.04.1USN-5136-1

Fixed in:4.15.0-1126.139USN-5136-1

linux-image-4.15.0-162-genericUbuntu

Fixed in:4.15.0-162.170~16.04.1USN-5136-1

Fixed in:4.15.0-162.170USN-5136-1

linux-image-4.15.0-162-generic-lpaeUbuntu

Fixed in:4.15.0-162.170USN-5136-1

linux-image-4.15.0-162-lowlatencyUbuntu

Fixed in:4.15.0-162.170~16.04.1USN-5136-1

Fixed in:4.15.0-162.170USN-5136-1

linux-image-5.10.0-1051-oemUbuntu

Fixed in:5.10.0-1051.53USN-5139-1

linux-image-5.11.0-1022-awsUbuntu

Fixed in:5.11.0-1022.23~20.04.1USN-5161-1

linux-image-5.11.0-1022-azureUbuntu

Fixed in:5.11.0-1022.23~20.04.1USN-5161-1

linux-image-5.11.0-1022-oracleUbuntu

Fixed in:5.11.0-1022.23~20.04.1USN-5161-1

linux-image-5.11.0-1023-gcpUbuntu

Fixed in:5.11.0-1023.25~20.04.1USN-5161-1

linux-image-5.11.0-41-genericUbuntu

Fixed in:5.11.0-41.45~20.04.1USN-5161-1

linux-image-5.11.0-41-generic-64kUbuntu

Fixed in:5.11.0-41.45~20.04.1USN-5161-1

linux-image-5.11.0-41-generic-lpaeUbuntu

Fixed in:5.11.0-41.45~20.04.1USN-5161-1

linux-image-5.11.0-41-lowlatencyUbuntu

Fixed in:5.11.0-41.45~20.04.1USN-5161-1

linux-image-5.13.0-1020-oemUbuntu

Fixed in:5.13.0-1020.24USN-5162-1

linux-image-5.4.0-1008-ibmUbuntu

Fixed in:5.4.0-1008.9USN-5163-1

linux-image-5.4.0-1022-bluefieldUbuntu

Fixed in:5.4.0-1022.25USN-5163-1

linux-image-5.4.0-1027-gkeopUbuntu

Fixed in:5.4.0-1027.28~18.04.1USN-5163-1

Fixed in:5.4.0-1027.28USN-5163-1

linux-image-5.4.0-1047-raspiUbuntu

Fixed in:5.4.0-1047.52~18.04.1USN-5163-1

Fixed in:5.4.0-1047.52USN-5163-1

linux-image-5.4.0-1050-kvmUbuntu

Fixed in:5.4.0-1050.52USN-5163-1

linux-image-5.4.0-1056-gkeUbuntu

Fixed in:5.4.0-1056.59~18.04.1USN-5163-1

Fixed in:5.4.0-1056.59USN-5163-1

linux-image-5.4.0-1058-gcpUbuntu

Fixed in:5.4.0-1058.62~18.04.1USN-5163-1

Fixed in:5.4.0-1058.62USN-5163-1

linux-image-5.4.0-1058-oracleUbuntu

Fixed in:5.4.0-1058.62~18.04.1USN-5163-1

Fixed in:5.4.0-1058.62USN-5163-1

linux-image-5.4.0-1060-awsUbuntu

Fixed in:5.4.0-1060.63~18.04.1USN-5163-1

Fixed in:5.4.0-1060.63USN-5163-1

linux-image-5.4.0-1064-azureUbuntu

Fixed in:5.4.0-1064.67~18.04.1USN-5163-1

Fixed in:5.4.0-1064.67USN-5163-1

linux-image-5.4.0-91-genericUbuntu

Fixed in:5.4.0-91.102~18.04.1USN-5163-1

Fixed in:5.4.0-91.102USN-5163-1

linux-image-5.4.0-91-generic-lpaeUbuntu

Fixed in:5.4.0-91.102~18.04.1USN-5163-1

Fixed in:5.4.0-91.102USN-5163-1

linux-image-5.4.0-91-lowlatencyUbuntu

Fixed in:5.4.0-91.102~18.04.1USN-5163-1

Fixed in:5.4.0-91.102USN-5163-1

linux-image-awsUbuntu

Fixed in:5.4.0.1060.43USN-5163-1

Fixed in:5.11.0.1022.23~20.04.21USN-5161-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1115.105USN-5136-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1115.118USN-5136-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1060.63USN-5163-1

linux-image-azureUbuntu

Fixed in:4.15.0.1126.99USN-5136-1

Fixed in:4.15.0.1126.117USN-5136-1

Fixed in:5.4.0.1064.44USN-5163-1

Fixed in:5.11.0.1022.23~20.04.22USN-5161-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1126.99USN-5136-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1064.62USN-5163-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1022.23USN-5163-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1030.32USN-5136-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1111.112USN-5136-1

Fixed in:5.4.0.1058.44USN-5163-1

Fixed in:5.11.0.1023.25~20.04.22USN-5161-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1111.130USN-5136-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1058.68USN-5163-1

linux-image-genericUbuntu

Fixed in:4.15.0.162.151USN-5136-1

Fixed in:5.4.0.91.95USN-5163-1

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

Fixed in:5.11.0.41.45~20.04.19USN-5161-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.162.155USN-5136-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.91.102~18.04.81USN-5163-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.11.0.41.45~20.04.19USN-5161-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.162.151USN-5136-1

Fixed in:5.4.0.91.95USN-5163-1

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

Fixed in:5.4.0.91.102~18.04.81USN-5163-1

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

Fixed in:5.11.0.41.45~20.04.19USN-5161-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1111.112USN-5136-1

Fixed in:5.4.0.1056.66USN-5163-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1056.59~18.04.21USN-5163-1

Fixed in:5.4.0.1056.66USN-5163-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1027.30USN-5163-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1027.28~18.04.28USN-5163-1

Fixed in:5.4.0.1027.30USN-5163-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1008.9USN-5163-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1008.9USN-5163-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1102.98USN-5136-1

Fixed in:5.4.0.1050.49USN-5163-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.162.151USN-5136-1

Fixed in:5.4.0.91.95USN-5163-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.162.155USN-5136-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.91.102~18.04.81USN-5163-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.11.0.41.45~20.04.19USN-5161-1

linux-image-oemUbuntu

Fixed in:4.15.0.162.155USN-5136-1

Fixed in:5.4.0.91.102~18.04.81USN-5163-1

Fixed in:5.4.0.91.95USN-5163-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1051.53USN-5139-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1051.53USN-5139-1

linux-image-oem-20.04cUbuntu

Fixed in:5.13.0.1020.24USN-5162-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.91.102~18.04.81USN-5163-1

Fixed in:5.4.0.91.95USN-5163-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1083.71USN-5136-1

Fixed in:5.4.0.1058.62~18.04.38USN-5163-1

Fixed in:5.11.0.1022.23~20.04.15USN-5161-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1083.93USN-5136-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1058.58USN-5163-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1047.82USN-5163-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1047.50USN-5163-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1098.96USN-5136-1

Fixed in:5.4.0.1047.82USN-5163-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1115.118USN-5136-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.91.102~18.04.81USN-5163-1

linux-image-virtualUbuntu

Fixed in:4.15.0.162.151USN-5136-1

Fixed in:5.4.0.91.95USN-5163-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.162.155USN-5136-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.91.102~18.04.81USN-5163-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.11.0.41.45~20.04.19USN-5161-1

linux-kvmUbuntu

Fixed in:4.15.0-1102.104USN-5136-1

Fixed in:5.4.0-1050.52USN-5163-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1051.53USN-5139-1

linux-oem-5.13Ubuntu

Fixed in:5.13.0-1020.24USN-5162-1

linux-oracleUbuntu

Fixed in:4.15.0-1083.91~16.04.1USN-5136-1

Fixed in:4.15.0-1083.91USN-5136-1

Fixed in:5.4.0-1058.62USN-5163-1

linux-oracle-5.11Ubuntu

Fixed in:5.11.0-1022.23~20.04.1USN-5161-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1058.62~18.04.1USN-5163-1

linux-raspiUbuntu

Fixed in:5.4.0-1047.52USN-5163-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1047.52~18.04.1USN-5163-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1098.104USN-5136-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1115.124USN-5136-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory2

Related Vulnerabilities

Other CWE-909 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-14647	High	7.5	11%	-	Fix
CVE-2019-9639	High	7.5	8.2%	-	Fix
CVE-2018-10811	High	7.5	6.2%	-	Fix
CVE-2020-12352	Medium	6.5	5.7%	-	Fix
CVE-2019-3804	High	7.5	4.9%	-	Fix
CVE-2020-16932	High	7.8	4.8%	-	-

Common questions

How do I fix CVE-2021-3655?

Published advisories record a fix for 116 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-3655 being actively exploited?

Not that we know of. CVE-2021-3655 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.31% is the estimated probability that it will be exploited in the next 30 days. That is higher than 23% of all scored CVEs.

How severe is CVE-2021-3655?

CVE-2021-3655 has a CVSS v3 base score of 3.3, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-3655 affect?

Published advisories record a fix for linux (Debian), linux (Ubuntu), linux-aws (Ubuntu), linux-aws-5.11 (Ubuntu), and 112 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-3655

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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.