Is CVE-2021-4159 in the CISA KEV catalog?

No. CVE-2021-4159 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4159?

CVE-2021-4159 has a CVSS v3 base score of 4.4 (MEDIUM).

What is the EPSS score for CVE-2021-4159?

CVE-2021-4159 has an EPSS score of 0.24% (15th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4159?

Upgrade linux on debian 11 to 5.7.6-1 or later. Fixes are available for 90 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4159

MEDIUM

4.4

CVSS v3

NVD

Description

A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.

CWE-202

How to fix

Remediation Available

linuxDebian

Fixed in:5.7.6-1CVE-2021-4159

linuxUbuntu

Fixed in:4.15.0-201.212USN-5790-1

Fixed in:5.4.0-128.144USN-5668-1

linux-awsUbuntu

Fixed in:4.15.0-1147.159USN-5790-1

Fixed in:5.4.0-1086.93USN-5668-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1086.93~18.04.1USN-5682-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1147.159~16.04.1USN-5790-1

linux-azureUbuntu

Fixed in:4.15.0-1158.173~14.04.1USN-5790-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1158.173USN-5790-1

linux-azure-fdeUbuntu

Fixed in:5.4.0-1092.97+cvm1.1USN-5706-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1047.52USN-5668-1

linux-dell300xUbuntu

Fixed in:4.15.0-1058.63USN-5790-1

linux-gcpUbuntu

Fixed in:4.15.0-1142.158~16.04.1USN-5790-1

Fixed in:5.4.0-1090.98USN-5677-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1142.158USN-5790-1

linux-gkeUbuntu

Fixed in:5.4.0-1084.90USN-5668-1

linux-gkeopUbuntu

Fixed in:5.4.0-1054.57USN-5668-1

linux-hweUbuntu

Fixed in:4.15.0-201.212~16.04.1USN-5790-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-128.144~18.04.1USN-5668-1

linux-ibmUbuntu

Fixed in:5.4.0-1034.38USN-5668-1

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1034.38~18.04.1USN-5668-1

linux-image-4.15.0-1058-dell300xUbuntu

Fixed in:4.15.0-1058.63USN-5790-1

linux-image-4.15.0-1112-oracleUbuntu

Fixed in:4.15.0-1112.123~16.04.1USN-5790-1

Fixed in:4.15.0-1112.123USN-5790-1

linux-image-4.15.0-1125-raspi2Ubuntu

Fixed in:4.15.0-1125.133USN-5790-1

linux-image-4.15.0-1133-kvmUbuntu

Fixed in:4.15.0-1133.138USN-5790-1

linux-image-4.15.0-1142-gcpUbuntu

Fixed in:4.15.0-1142.158~16.04.1USN-5790-1

Fixed in:4.15.0-1142.158USN-5790-1

linux-image-4.15.0-1143-snapdragonUbuntu

Fixed in:4.15.0-1143.153USN-5790-1

linux-image-4.15.0-1147-awsUbuntu

Fixed in:4.15.0-1147.159USN-5790-1

linux-image-4.15.0-1147-aws-hweUbuntu

Fixed in:4.15.0-1147.159~16.04.1USN-5790-1

linux-image-4.15.0-1158-azureUbuntu

Fixed in:4.15.0-1158.173~14.04.1USN-5790-1

Fixed in:4.15.0-1158.173USN-5790-1

linux-image-4.15.0-201-genericUbuntu

Fixed in:4.15.0-201.212~16.04.1USN-5790-1

Fixed in:4.15.0-201.212USN-5790-1

linux-image-4.15.0-201-generic-lpaeUbuntu

Fixed in:4.15.0-201.212USN-5790-1

linux-image-4.15.0-201-lowlatencyUbuntu

Fixed in:4.15.0-201.212~16.04.1USN-5790-1

Fixed in:4.15.0-201.212USN-5790-1

linux-image-5.4.0-1034-ibmUbuntu

Fixed in:5.4.0-1034.38~18.04.1USN-5668-1

Fixed in:5.4.0-1034.38USN-5668-1

linux-image-5.4.0-1047-bluefieldUbuntu

Fixed in:5.4.0-1047.52USN-5668-1

linux-image-5.4.0-1054-gkeopUbuntu

Fixed in:5.4.0-1054.57USN-5668-1

linux-image-5.4.0-1071-raspiUbuntu

Fixed in:5.4.0-1071.81~18.04.1USN-5677-1

Fixed in:5.4.0-1071.81USN-5677-1

linux-image-5.4.0-1076-kvmUbuntu

Fixed in:5.4.0-1076.81USN-5668-1

linux-image-5.4.0-1084-gkeUbuntu

Fixed in:5.4.0-1084.90USN-5668-1

linux-image-5.4.0-1084-oracleUbuntu

Fixed in:5.4.0-1084.92~18.04.1USN-5677-1

Fixed in:5.4.0-1084.92USN-5668-1

linux-image-5.4.0-1086-awsUbuntu

Fixed in:5.4.0-1086.93~18.04.1USN-5682-1

Fixed in:5.4.0-1086.93USN-5668-1

linux-image-5.4.0-1090-gcpUbuntu

Fixed in:5.4.0-1090.98USN-5677-1

linux-image-5.4.0-1092-azure-fdeUbuntu

Fixed in:5.4.0-1092.97+cvm1.1USN-5706-1

linux-image-5.4.0-128-genericUbuntu

Fixed in:5.4.0-128.144~18.04.1USN-5668-1

Fixed in:5.4.0-128.144USN-5668-1

linux-image-5.4.0-128-generic-lpaeUbuntu

Fixed in:5.4.0-128.144~18.04.1USN-5668-1

Fixed in:5.4.0-128.144USN-5668-1

linux-image-5.4.0-128-lowlatencyUbuntu

Fixed in:5.4.0-128.144~18.04.1USN-5668-1

Fixed in:5.4.0-128.144USN-5668-1

linux-image-awsUbuntu

Fixed in:5.4.0.1086.66USN-5682-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1147.132USN-5790-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1147.145USN-5790-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1086.86USN-5668-1

linux-image-azureUbuntu

Fixed in:4.15.0.1158.125USN-5790-1

linux-image-azure-fdeUbuntu

Fixed in:5.4.0.1092.97+cvm1.32USN-5706-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1158.126USN-5790-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1047.46USN-5668-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1058.57USN-5790-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1142.134USN-5790-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1142.156USN-5790-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1090.95USN-5677-1

linux-image-genericUbuntu

Fixed in:4.15.0.201.184USN-5790-1

Fixed in:5.4.0.128.129USN-5668-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.201.186USN-5790-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.128.144~18.04.107USN-5668-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.201.184USN-5790-1

Fixed in:5.4.0.128.129USN-5668-1

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

Fixed in:5.4.0.128.144~18.04.107USN-5668-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1142.134USN-5790-1

Fixed in:5.4.0.1084.92USN-5668-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1084.92USN-5668-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1054.55USN-5668-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1054.55USN-5668-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1034.48USN-5668-1

Fixed in:5.4.0.1034.63USN-5668-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1034.63USN-5668-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1133.124USN-5790-1

Fixed in:5.4.0.1076.73USN-5668-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.201.184USN-5790-1

Fixed in:5.4.0.128.129USN-5668-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.201.186USN-5790-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.128.144~18.04.107USN-5668-1

linux-image-oemUbuntu

Fixed in:4.15.0.201.186USN-5790-1

Fixed in:5.4.0.128.144~18.04.107USN-5668-1

Fixed in:5.4.0.128.129USN-5668-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.128.144~18.04.107USN-5668-1

Fixed in:5.4.0.128.129USN-5668-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1112.94USN-5790-1

Fixed in:5.4.0.1084.92~18.04.61USN-5677-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1112.117USN-5790-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1084.81USN-5668-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1071.104USN-5677-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1071.71USN-5677-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1125.120USN-5790-1

Fixed in:5.4.0.1071.104USN-5677-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1143.142USN-5790-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.128.144~18.04.107USN-5668-1

linux-image-virtualUbuntu

Fixed in:4.15.0.201.184USN-5790-1

Fixed in:5.4.0.128.129USN-5668-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.201.186USN-5790-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.128.144~18.04.107USN-5668-1

linux-kvmUbuntu

Fixed in:4.15.0-1133.138USN-5790-1

Fixed in:5.4.0-1076.81USN-5668-1

linux-oracleUbuntu

Fixed in:4.15.0-1112.123~16.04.1USN-5790-1

Fixed in:4.15.0-1112.123USN-5790-1

Fixed in:5.4.0-1084.92USN-5668-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1084.92~18.04.1USN-5677-1

linux-raspiUbuntu

Fixed in:5.4.0-1071.81USN-5677-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1071.81~18.04.1USN-5677-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1125.133USN-5790-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1143.153USN-5790-1

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 RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.24%probability of exploitation in 30 days

15thpercentile

Low risk: more likely to be exploited than 15% of all known CVEs.

References

Patch1

git.kernel.org

Third-Party Advisory3

Issue Tracking1

bugzilla.redhat.com

Related Vulnerabilities

Other CWE-202 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-25205	High	8.2	4.0%	-	Fix
CVE-2025-69200	High	7.5	2.0%	-	Fix
CVE-2021-32743	High	8.8	1.8%	-	Fix
CVE-2019-19000	Medium	6.5	1.1%	-	-
CVE-2022-20747	Medium	6.5	0.9%	-	Fix
CVE-2023-0785	Low	3.7	0.9%	-	-

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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.