Is CVE-2021-4135 in the CISA KEV catalog?

No. CVE-2021-4135 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4135?

CVE-2021-4135 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-4135?

CVE-2021-4135 has an EPSS score of 0.23% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4135?

Upgrade linux on debian 11 to 5.10.92-1 or later. Fixes are available for 88 affected products.

CVE & CISA-KEV Catalog

CVE-2021-4135

MEDIUM

5.5

CVSS v3

NVD

Description

A memory leak vulnerability was found in the Linux kernel's eBPF for the Simulated networking device driver in the way user uses BPF for the device such that function nsim_map_alloc_elem being called. A local user could use this flaw to get unauthorized access to some data.

CWE-200Information Exposure CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.92-1CVE-2021-4135

Fixed in:5.15.15-1CVE-2021-4135

linuxUbuntu

Fixed in:5.4.0-105.119USN-5338-1

linux-awsUbuntu

Fixed in:5.4.0-1069.73USN-5338-1

linux-aws-5.13Ubuntu

Fixed in:5.13.0-1019.21~20.04.1USN-5337-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1069.73~18.04.1USN-5338-1

linux-azureUbuntu

Fixed in:5.4.0-1073.76USN-5338-1

linux-azure-5.13Ubuntu

Fixed in:5.13.0-1021.24~20.04.1USN-5368-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1073.76~18.04.1USN-5338-1

linux-azure-fdeUbuntu

Fixed in:5.4.0-1073.76+cvm1.1USN-5338-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1032.35USN-5377-1

linux-gcpUbuntu

Fixed in:5.4.0-1068.72USN-5338-1

linux-gcp-5.13Ubuntu

Fixed in:5.13.0-1021.25~20.04.1USN-5337-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1068.72~18.04.1USN-5338-1

linux-gkeUbuntu

Fixed in:5.4.0-1066.69USN-5338-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1066.69~18.04.1USN-5338-1

linux-gkeopUbuntu

Fixed in:5.4.0-1037.38USN-5338-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1037.38~18.04.1USN-5338-1

linux-hwe-5.13Ubuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-105.119~18.04.1USN-5338-1

linux-ibmUbuntu

Fixed in:5.4.0-1018.20USN-5338-1

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1018.20~18.04.1USN-5338-1

linux-image-5.13.0-1019-awsUbuntu

Fixed in:5.13.0-1019.21~20.04.1USN-5337-1

linux-image-5.13.0-1021-azureUbuntu

Fixed in:5.13.0-1021.24~20.04.1USN-5368-1

linux-image-5.13.0-1021-gcpUbuntu

Fixed in:5.13.0-1021.25~20.04.1USN-5337-1

linux-image-5.13.0-1025-oracleUbuntu

Fixed in:5.13.0-1025.30~20.04.1USN-5368-1

linux-image-5.13.0-37-genericUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.13.0-37-generic-64kUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.13.0-37-generic-lpaeUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.13.0-37-lowlatencyUbuntu

Fixed in:5.13.0-37.42~20.04.1USN-5337-1

linux-image-5.14.0-1022-oemUbuntu

Fixed in:5.14.0-1022.24USN-5278-1

linux-image-5.4.0-1018-ibmUbuntu

Fixed in:5.4.0-1018.20~18.04.1USN-5338-1

Fixed in:5.4.0-1018.20USN-5338-1

linux-image-5.4.0-1032-bluefieldUbuntu

Fixed in:5.4.0-1032.35USN-5377-1

linux-image-5.4.0-1037-gkeopUbuntu

Fixed in:5.4.0-1037.38~18.04.1USN-5338-1

Fixed in:5.4.0-1037.38USN-5338-1

linux-image-5.4.0-105-genericUbuntu

Fixed in:5.4.0-105.119~18.04.1USN-5338-1

Fixed in:5.4.0-105.119USN-5338-1

linux-image-5.4.0-105-generic-lpaeUbuntu

Fixed in:5.4.0-105.119~18.04.1USN-5338-1

Fixed in:5.4.0-105.119USN-5338-1

linux-image-5.4.0-105-lowlatencyUbuntu

Fixed in:5.4.0-105.119~18.04.1USN-5338-1

Fixed in:5.4.0-105.119USN-5338-1

linux-image-5.4.0-1056-raspiUbuntu

Fixed in:5.4.0-1056.63~18.04.1USN-5338-1

Fixed in:5.4.0-1056.63USN-5338-1

linux-image-5.4.0-1059-kvmUbuntu

Fixed in:5.4.0-1059.62USN-5338-1

linux-image-5.4.0-1066-gkeUbuntu

Fixed in:5.4.0-1066.69~18.04.1USN-5338-1

Fixed in:5.4.0-1066.69USN-5338-1

linux-image-5.4.0-1067-oracleUbuntu

Fixed in:5.4.0-1067.72~18.04.1USN-5338-1

Fixed in:5.4.0-1067.72USN-5338-1

linux-image-5.4.0-1068-gcpUbuntu

Fixed in:5.4.0-1068.72~18.04.1USN-5338-1

Fixed in:5.4.0-1068.72USN-5338-1

linux-image-5.4.0-1069-awsUbuntu

Fixed in:5.4.0-1069.73~18.04.1USN-5338-1

Fixed in:5.4.0-1069.73USN-5338-1

linux-image-5.4.0-1073-azureUbuntu

Fixed in:5.4.0-1073.76~18.04.1USN-5338-1

Fixed in:5.4.0-1073.76USN-5338-1

linux-image-5.4.0-1073-azure-fdeUbuntu

Fixed in:5.4.0-1073.76+cvm1.1USN-5338-1

linux-image-awsUbuntu

Fixed in:5.4.0.1069.51USN-5338-1

Fixed in:5.13.0.1019.21~20.04.12USN-5337-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1069.71USN-5338-1

linux-image-azureUbuntu

Fixed in:5.4.0.1073.52USN-5338-1

Fixed in:5.13.0.1021.24~20.04.10USN-5368-1

linux-image-azure-fdeUbuntu

Fixed in:5.4.0.1073.76+cvm1.19USN-5338-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1073.71USN-5338-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1032.33USN-5377-1

linux-image-gcpUbuntu

Fixed in:5.4.0.1068.53USN-5338-1

Fixed in:5.13.0.1021.25~20.04.1USN-5337-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1068.77USN-5338-1

linux-image-genericUbuntu

Fixed in:5.4.0.105.109USN-5338-1

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

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.105.119~18.04.90USN-5338-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-generic-lpaeUbuntu

Fixed in:5.4.0.105.109USN-5338-1

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

Fixed in:5.4.0.105.119~18.04.90USN-5338-1

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

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-gkeUbuntu

Fixed in:5.4.0.1066.76USN-5338-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1066.69~18.04.30USN-5338-1

Fixed in:5.4.0.1066.76USN-5338-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1037.40USN-5338-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1037.38~18.04.37USN-5338-1

Fixed in:5.4.0.1037.40USN-5338-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1018.35USN-5338-1

Fixed in:5.4.0.1018.18USN-5338-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1018.18USN-5338-1

linux-image-kvmUbuntu

Fixed in:5.4.0.1059.58USN-5338-1

linux-image-lowlatencyUbuntu

Fixed in:5.4.0.105.109USN-5338-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.105.119~18.04.90USN-5338-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-image-oemUbuntu

Fixed in:5.4.0.105.119~18.04.90USN-5338-1

Fixed in:5.4.0.105.109USN-5338-1

linux-image-oem-20.04dUbuntu

Fixed in:5.14.0.1022.19USN-5278-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.105.119~18.04.90USN-5338-1

Fixed in:5.4.0.105.109USN-5338-1

linux-image-oracleUbuntu

Fixed in:5.4.0.1067.72~18.04.46USN-5338-1

Fixed in:5.13.0.1025.30~20.04.1USN-5368-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1067.67USN-5338-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1056.90USN-5338-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1056.58USN-5338-1

linux-image-raspi2Ubuntu

Fixed in:5.4.0.1056.90USN-5338-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.105.119~18.04.90USN-5338-1

linux-image-virtualUbuntu

Fixed in:5.4.0.105.109USN-5338-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.105.119~18.04.90USN-5338-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.13.0.37.42~20.04.22USN-5337-1

linux-kvmUbuntu

Fixed in:5.4.0-1059.62USN-5338-1

linux-oem-5.14Ubuntu

Fixed in:5.14.0-1022.24USN-5278-1

linux-oracleUbuntu

Fixed in:5.4.0-1067.72USN-5338-1

linux-oracle-5.13Ubuntu

Fixed in:5.13.0-1025.30~20.04.1USN-5368-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1067.72~18.04.1USN-5338-1

linux-raspiUbuntu

Fixed in:5.4.0-1056.63USN-5338-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1056.63~18.04.1USN-5338-1

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

AvailabilityNone

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

Exploit Intelligence

0.23%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Patch1

git.kernel.org

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	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.