Is CVE-2021-3506 in the CISA KEV catalog?

No. CVE-2021-3506 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3506?

CVE-2021-3506 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-3506?

CVE-2021-3506 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3506?

Upgrade linux on debian 11 to 5.10.38-1 or later. Fixes are available for 116 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3506

HIGH

7.1

CVSS v3

NVD

Description

An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.38-1CVE-2021-3506

linuxUbuntu

Fixed in:4.4.0-222.255USN-5343-1

Fixed in:4.15.0-173.182USN-5339-1

Fixed in:5.4.0-77.86USN-5000-1

linux-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

Fixed in:4.4.0-1138.152USN-5343-1

Fixed in:4.15.0-1124.133USN-5339-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

linux-aws-5.8Ubuntu

Fixed in:5.8.0-1041.43~20.04.1USN-5016-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1124.133~16.04.1USN-5339-1

linux-azureUbuntu

Fixed in:4.15.0-1134.147~14.04.1USN-5339-1

Fixed in:4.15.0-1134.147~16.04.1USN-5339-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1134.147USN-5339-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

linux-azure-5.8Ubuntu

Fixed in:5.8.0-1039.42~20.04.1USN-5016-1

linux-dell300xUbuntu

Fixed in:4.15.0-1038.43USN-5339-1

linux-gcpUbuntu

Fixed in:4.15.0-1119.133~16.04.1USN-5339-1

Fixed in:5.4.0-1046.49USN-5000-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1119.133USN-5339-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1046.49~18.04.1USN-5000-1

linux-gcp-5.8Ubuntu

Fixed in:5.8.0-1038.40~20.04.1USN-5016-1

linux-gkeUbuntu

Fixed in:5.4.0-1046.48USN-5000-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1046.48~18.04.1USN-5000-1

linux-gkeopUbuntu

Fixed in:5.4.0-1018.19USN-5000-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1018.19~18.04.1USN-5000-1

linux-hweUbuntu

Fixed in:4.15.0-173.182~16.04.1USN-5339-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-4.15.0-1038-dell300xUbuntu

Fixed in:4.15.0-1038.43USN-5339-1

linux-image-4.15.0-1090-oracleUbuntu

Fixed in:4.15.0-1090.99~16.04.1USN-5339-1

Fixed in:4.15.0-1090.99USN-5339-1

linux-image-4.15.0-1106-raspi2Ubuntu

Fixed in:4.15.0-1106.113USN-5339-1

linux-image-4.15.0-1110-kvmUbuntu

Fixed in:4.15.0-1110.113USN-5339-1

linux-image-4.15.0-1119-gcpUbuntu

Fixed in:4.15.0-1119.133~16.04.1USN-5339-1

Fixed in:4.15.0-1119.133USN-5339-1

linux-image-4.15.0-1123-snapdragonUbuntu

Fixed in:4.15.0-1123.132USN-5339-1

linux-image-4.15.0-1124-awsUbuntu

Fixed in:4.15.0-1124.133USN-5339-1

linux-image-4.15.0-1124-aws-hweUbuntu

Fixed in:4.15.0-1124.133~16.04.1USN-5339-1

linux-image-4.15.0-1134-azureUbuntu

Fixed in:4.15.0-1134.147~14.04.1USN-5339-1

Fixed in:4.15.0-1134.147~16.04.1USN-5339-1

Fixed in:4.15.0-1134.147USN-5339-1

linux-image-4.15.0-173-genericUbuntu

Fixed in:4.15.0-173.182~16.04.1USN-5339-1

Fixed in:4.15.0-173.182USN-5339-1

linux-image-4.15.0-173-generic-lpaeUbuntu

Fixed in:4.15.0-173.182USN-5339-1

linux-image-4.15.0-173-lowlatencyUbuntu

Fixed in:4.15.0-173.182~16.04.1USN-5339-1

Fixed in:4.15.0-173.182USN-5339-1

linux-image-4.4.0-1102-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

linux-image-4.4.0-1103-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

linux-image-4.4.0-1138-awsUbuntu

Fixed in:4.4.0-1138.152USN-5343-1

linux-image-4.4.0-222-genericUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-4.4.0-222-lowlatencyUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-5.10.0-1033-oemUbuntu

Fixed in:5.10.0-1033.34USN-5001-1

linux-image-5.4.0-1018-gkeopUbuntu

Fixed in:5.4.0-1018.19~18.04.1USN-5000-1

Fixed in:5.4.0-1018.19USN-5000-1

linux-image-5.4.0-1038-raspiUbuntu

Fixed in:5.4.0-1038.41~18.04.1USN-5000-1

Fixed in:5.4.0-1038.41USN-5000-1

linux-image-5.4.0-1041-kvmUbuntu

Fixed in:5.4.0-1041.42USN-5000-2

linux-image-5.4.0-1046-gcpUbuntu

Fixed in:5.4.0-1046.49~18.04.1USN-5000-1

Fixed in:5.4.0-1046.49USN-5000-1

linux-image-5.4.0-1046-gkeUbuntu

Fixed in:5.4.0-1046.48~18.04.1USN-5000-1

Fixed in:5.4.0-1046.48USN-5000-1

linux-image-5.4.0-1048-oracleUbuntu

Fixed in:5.4.0-1048.52~18.04.1USN-5000-1

Fixed in:5.4.0-1048.52USN-5000-1

linux-image-5.4.0-1051-awsUbuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-image-5.4.0-1051-azureUbuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-image-5.4.0-77-genericUbuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

Fixed in:5.4.0-77.86USN-5000-1

linux-image-5.4.0-77-generic-lpaeUbuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

Fixed in:5.4.0-77.86USN-5000-1

linux-image-5.4.0-77-lowlatencyUbuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

Fixed in:5.4.0-77.86USN-5000-1

linux-image-5.8.0-1037-oracleUbuntu

Fixed in:5.8.0-1037.38~20.04.1USN-5016-1

linux-image-5.8.0-1038-gcpUbuntu

Fixed in:5.8.0-1038.40~20.04.1USN-5016-1

linux-image-5.8.0-1039-azureUbuntu

Fixed in:5.8.0-1039.42~20.04.1USN-5016-1

linux-image-5.8.0-1041-awsUbuntu

Fixed in:5.8.0-1041.43~20.04.1USN-5016-1

linux-image-5.8.0-63-genericUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-5.8.0-63-generic-64kUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-5.8.0-63-generic-lpaeUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-5.8.0-63-lowlatencyUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-awsUbuntu

Fixed in:4.4.0.1102.100USN-5343-1

Fixed in:4.4.0.1138.143USN-5343-1

Fixed in:5.4.0.1051.33USN-5000-1

Fixed in:5.8.0.1041.43~20.04.13USN-5016-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1124.114USN-5339-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1124.127USN-5339-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1051.53USN-5000-1

linux-image-azureUbuntu

Fixed in:4.15.0.1134.107USN-5339-1

Fixed in:4.15.0.1134.125USN-5339-1

Fixed in:5.4.0.1051.30USN-5000-1

Fixed in:5.8.0.1039.42~20.04.11USN-5016-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1134.107USN-5339-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1051.49USN-5000-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1038.40USN-5339-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1119.120USN-5339-1

Fixed in:5.4.0.1046.33USN-5000-1

Fixed in:5.8.0.1038.40~20.04.13USN-5016-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1119.138USN-5339-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1046.55USN-5000-1

linux-image-genericUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.173.162USN-5339-1

Fixed in:5.4.0.77.80USN-5000-1

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

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.173.165USN-5339-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.173.162USN-5339-1

Fixed in:5.4.0.77.80USN-5000-1

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

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

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

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1119.120USN-5339-1

Fixed in:5.4.0.1046.55USN-5000-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1046.48~18.04.12USN-5000-1

Fixed in:5.4.0.1046.55USN-5000-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1018.21USN-5000-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1018.19~18.04.19USN-5000-1

Fixed in:5.4.0.1018.21USN-5000-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1103.101USN-5343-1

Fixed in:4.15.0.1110.106USN-5339-1

Fixed in:5.4.0.1041.39USN-5000-2

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.173.162USN-5339-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.173.165USN-5339-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-image-oemUbuntu

Fixed in:4.15.0.173.165USN-5339-1

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1033.34USN-5001-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1033.34USN-5001-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1090.78USN-5339-1

Fixed in:5.4.0.1048.52~18.04.30USN-5000-1

Fixed in:5.8.0.1037.38~20.04.13USN-5016-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1090.100USN-5339-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1048.48USN-5000-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1038.73USN-5000-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1038.40USN-5000-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1106.104USN-5339-1

Fixed in:5.4.0.1038.73USN-5000-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1123.126USN-5339-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-virtualUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.173.162USN-5339-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.173.165USN-5339-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.222.193USN-5343-1

linux-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

Fixed in:4.15.0-1110.113USN-5339-1

Fixed in:5.4.0-1041.42USN-5000-2

linux-lts-xenialUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1033.34USN-5001-1

linux-oracleUbuntu

Fixed in:4.15.0-1090.99~16.04.1USN-5339-1

Fixed in:4.15.0-1090.99USN-5339-1

Fixed in:5.4.0-1048.52USN-5000-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1048.52~18.04.1USN-5000-1

linux-oracle-5.8Ubuntu

Fixed in:5.8.0-1037.38~20.04.1USN-5016-1

linux-raspiUbuntu

Fixed in:5.4.0-1038.41USN-5000-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1038.41~18.04.1USN-5000-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1106.113USN-5339-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1123.132USN-5339-1

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

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Patch2

Third-Party Advisory3

Other references1

mail-archive.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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.