Is CVE-2021-27365 in the CISA KEV catalog?

No. CVE-2021-27365 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-27365?

CVE-2021-27365 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-27365?

CVE-2021-27365 has an EPSS score of 2.08% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-27365?

Upgrade linux on debian 11 to 5.10.24-1 or later. Fixes are available for 130 affected products.

CVE & CISA-KEV Catalog

CVE-2021-27365

HIGHEPSS 79th pctl

7.8

CVSS v3

NVD

Description

An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.24-1CVE-2021-27365

linuxUbuntu

Fixed in:3.13.0-185.236USN-4889-1

Fixed in:4.4.0-206.238USN-4883-1

Fixed in:4.15.0-139.143USN-4883-1

Fixed in:5.4.0-70.78USN-4887-1

linux-awsUbuntu

Fixed in:4.4.0-1088.92USN-4883-1

Fixed in:4.4.0-1124.138USN-4883-1

Fixed in:4.15.0-1096.103USN-4883-1

Fixed in:5.4.0-1041.43USN-4887-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1041.43~18.04.1USN-4887-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1096.103~16.04.1USN-4883-1

linux-azureUbuntu

Fixed in:4.15.0-1110.122~14.04.1USN-4883-1

Fixed in:4.15.0-1110.122~16.04.1USN-4883-1

Fixed in:5.4.0-1043.45USN-4887-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1110.122USN-4883-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4887-1

linux-gcpUbuntu

Fixed in:4.15.0-1095.108~16.04.1USN-4883-1

Fixed in:5.4.0-1040.43USN-4887-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1095.108USN-4883-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1040.43~18.04.1USN-4887-1

linux-gke-5.3Ubuntu

Fixed in:5.3.0-1041.44USN-4887-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1039.41~18.04.1USN-4887-1

linux-gkeopUbuntu

Fixed in:5.4.0-1012.13USN-4887-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1012.13~18.04.1USN-4887-1

linux-hweUbuntu

Fixed in:4.15.0-139.143~16.04.1USN-4883-1

Fixed in:5.3.0-72.68USN-4887-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-3.13.0-185-genericUbuntu

Fixed in:3.13.0-185.236USN-4889-1

linux-image-3.13.0-185-generic-lpaeUbuntu

Fixed in:3.13.0-185.236USN-4889-1

linux-image-3.13.0-185-lowlatencyUbuntu

Fixed in:3.13.0-185.236USN-4889-1

linux-image-4.15.0-1067-oracleUbuntu

Fixed in:4.15.0-1067.75~16.04.1USN-4883-1

Fixed in:4.15.0-1067.75USN-4883-1

linux-image-4.15.0-1081-raspi2Ubuntu

Fixed in:4.15.0-1081.86USN-4883-1

linux-image-4.15.0-1087-kvmUbuntu

Fixed in:4.15.0-1087.89USN-4883-1

linux-image-4.15.0-1095-gcpUbuntu

Fixed in:4.15.0-1095.108~16.04.1USN-4883-1

Fixed in:4.15.0-1095.108USN-4883-1

linux-image-4.15.0-1096-awsUbuntu

Fixed in:4.15.0-1096.103~16.04.1USN-4883-1

Fixed in:4.15.0-1096.103USN-4883-1

linux-image-4.15.0-1098-snapdragonUbuntu

Fixed in:4.15.0-1098.107USN-4883-1

linux-image-4.15.0-1110-azureUbuntu

Fixed in:4.15.0-1110.122~14.04.1USN-4883-1

Fixed in:4.15.0-1110.122~16.04.1USN-4883-1

Fixed in:4.15.0-1110.122USN-4883-1

linux-image-4.15.0-139-genericUbuntu

Fixed in:4.15.0-139.143~16.04.1USN-4883-1

Fixed in:4.15.0-139.143USN-4883-1

linux-image-4.15.0-139-generic-lpaeUbuntu

Fixed in:4.15.0-139.143~16.04.1USN-4883-1

Fixed in:4.15.0-139.143USN-4883-1

linux-image-4.15.0-139-lowlatencyUbuntu

Fixed in:4.15.0-139.143~16.04.1USN-4883-1

Fixed in:4.15.0-139.143USN-4883-1

linux-image-4.4.0-1088-awsUbuntu

Fixed in:4.4.0-1088.92USN-4883-1

linux-image-4.4.0-1090-kvmUbuntu

Fixed in:4.4.0-1090.99USN-4883-1

linux-image-4.4.0-1124-awsUbuntu

Fixed in:4.4.0-1124.138USN-4883-1

linux-image-4.4.0-1148-raspi2Ubuntu

Fixed in:4.4.0-1148.158USN-4883-1

linux-image-4.4.0-1152-snapdragonUbuntu

Fixed in:4.4.0-1152.162USN-4883-1

linux-image-4.4.0-206-genericUbuntu

Fixed in:4.4.0-206.238~14.04.1USN-4889-1

Fixed in:4.4.0-206.238USN-4883-1

linux-image-4.4.0-206-generic-lpaeUbuntu

Fixed in:4.4.0-206.238~14.04.1USN-4889-1

Fixed in:4.4.0-206.238USN-4883-1

linux-image-4.4.0-206-lowlatencyUbuntu

Fixed in:4.4.0-206.238~14.04.1USN-4889-1

Fixed in:4.4.0-206.238USN-4883-1

linux-image-4.4.0-206-powerpc-e500mcUbuntu

Fixed in:4.4.0-206.238USN-4883-1

linux-image-4.4.0-206-powerpc-smpUbuntu

Fixed in:4.4.0-206.238USN-4883-1

linux-image-4.4.0-206-powerpc64-embUbuntu

Fixed in:4.4.0-206.238USN-4883-1

linux-image-4.4.0-206-powerpc64-smpUbuntu

Fixed in:4.4.0-206.238USN-4883-1

linux-image-5.10.0-1019-oemUbuntu

Fixed in:5.10.0-1019.20USN-4887-1

linux-image-5.3.0-1038-raspi2Ubuntu

Fixed in:5.3.0-1038.40USN-4887-1

linux-image-5.3.0-1041-gkeUbuntu

Fixed in:5.3.0-1041.44USN-4887-1

linux-image-5.3.0-72-genericUbuntu

Fixed in:5.3.0-72.68USN-4887-1

linux-image-5.3.0-72-lowlatencyUbuntu

Fixed in:5.3.0-72.68USN-4887-1

linux-image-5.4.0-1012-gkeopUbuntu

Fixed in:5.4.0-1012.13~18.04.1USN-4887-1

Fixed in:5.4.0-1012.13USN-4887-1

linux-image-5.4.0-1032-raspiUbuntu

Fixed in:5.4.0-1032.35~18.04.1USN-4887-1

Fixed in:5.4.0-1032.35USN-4887-1

linux-image-5.4.0-1036-kvmUbuntu

Fixed in:5.4.0-1036.37USN-4887-1

linux-image-5.4.0-1039-gkeUbuntu

Fixed in:5.4.0-1039.41~18.04.1USN-4887-1

linux-image-5.4.0-1040-gcpUbuntu

Fixed in:5.4.0-1040.43~18.04.1USN-4887-1

Fixed in:5.4.0-1040.43USN-4887-1

linux-image-5.4.0-1041-awsUbuntu

Fixed in:5.4.0-1041.43~18.04.1USN-4887-1

Fixed in:5.4.0-1041.43USN-4887-1

linux-image-5.4.0-1041-oracleUbuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4887-1

Fixed in:5.4.0-1041.44USN-4887-1

linux-image-5.4.0-1043-azureUbuntu

Fixed in:5.4.0-1043.45~18.04.1USN-4887-1

Fixed in:5.4.0-1043.45USN-4887-1

linux-image-5.4.0-70-genericUbuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

Fixed in:5.4.0-70.78USN-4887-1

linux-image-5.4.0-70-generic-lpaeUbuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

Fixed in:5.4.0-70.78USN-4887-1

linux-image-5.4.0-70-lowlatencyUbuntu

Fixed in:5.4.0-70.78~18.04.1USN-4887-1

Fixed in:5.4.0-70.78USN-4887-1

linux-image-5.6.0-1052-oemUbuntu

Fixed in:5.6.0-1052.56USN-4887-1

linux-image-5.8.0-48-genericUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-5.8.0-48-generic-64kUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-5.8.0-48-generic-lpaeUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-5.8.0-48-lowlatencyUbuntu

Fixed in:5.8.0-48.54~20.04.1USN-4887-1

linux-image-awsUbuntu

Fixed in:4.4.0.1088.85USN-4883-1

Fixed in:4.4.0.1124.129USN-4883-1

Fixed in:5.4.0.1041.24USN-4887-1

Fixed in:5.4.0.1041.42USN-4887-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1096.89USN-4883-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1096.99USN-4883-1

linux-image-azureUbuntu

Fixed in:4.15.0.1110.83USN-4883-1

Fixed in:4.15.0.1110.101USN-4883-1

Fixed in:5.4.0.1043.23USN-4887-1

Fixed in:5.4.0.1043.41USN-4887-1

linux-image-azure-edgeUbuntu

Fixed in:4.15.0.1110.101USN-4883-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1110.83USN-4883-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1095.96USN-4883-1

Fixed in:5.4.0.1040.27USN-4887-1

Fixed in:5.4.0.1040.49USN-4887-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1095.113USN-4883-1

linux-image-genericUbuntu

Fixed in:3.13.0.185.194USN-4889-1

Fixed in:4.4.0.206.212USN-4883-1

Fixed in:4.15.0.139.126USN-4883-1

Fixed in:5.4.0.70.73USN-4887-1

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

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.139.134USN-4883-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-generic-lpaeUbuntu

Fixed in:3.13.0.185.194USN-4889-1

Fixed in:4.4.0.206.212USN-4883-1

Fixed in:4.15.0.139.126USN-4883-1

Fixed in:5.4.0.70.73USN-4887-1

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

Fixed in:4.15.0.139.134USN-4883-1

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

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

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

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-generic-lpae-lts-xenialUbuntu

Fixed in:4.4.0.206.179USN-4889-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.206.179USN-4889-1

linux-image-generic-paeUbuntu

Fixed in:3.13.0.185.194USN-4889-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1095.96USN-4883-1

linux-image-gke-5.3Ubuntu

Fixed in:5.3.0.1041.24USN-4887-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1039.41~18.04.6USN-4887-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1012.15USN-4887-1

linux-image-gkeop-5.3Ubuntu

Fixed in:5.3.0.72.129USN-4887-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1012.13~18.04.13USN-4887-1

Fixed in:5.4.0.1012.15USN-4887-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1090.88USN-4883-1

Fixed in:4.15.0.1087.83USN-4883-1

Fixed in:5.4.0.1036.34USN-4887-1

linux-image-lowlatencyUbuntu

Fixed in:3.13.0.185.194USN-4889-1

Fixed in:4.4.0.206.212USN-4883-1

Fixed in:4.15.0.139.126USN-4883-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.139.134USN-4883-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.206.179USN-4889-1

linux-image-lowlatency-paeUbuntu

Fixed in:3.13.0.185.194USN-4889-1

linux-image-oemUbuntu

Fixed in:4.15.0.139.134USN-4883-1

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-oem-20.04Ubuntu

Fixed in:5.6.0.1052.48USN-4887-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1019.20USN-4887-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1067.55USN-4883-1

Fixed in:5.4.0.1041.44~18.04.23USN-4887-1

Fixed in:5.4.0.1041.38USN-4887-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1067.77USN-4883-1

linux-image-powerpc-e500mcUbuntu

Fixed in:4.4.0.206.212USN-4883-1

linux-image-powerpc-smpUbuntu

Fixed in:4.4.0.206.212USN-4883-1

linux-image-powerpc64-embUbuntu

Fixed in:4.4.0.206.212USN-4883-1

linux-image-powerpc64-smpUbuntu

Fixed in:4.4.0.206.212USN-4883-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1032.67USN-4887-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1032.34USN-4887-1

linux-image-raspi2Ubuntu

Fixed in:4.4.0.1148.148USN-4883-1

Fixed in:4.15.0.1081.78USN-4883-1

Fixed in:5.4.0.1032.67USN-4887-1

linux-image-raspi2-hwe-18.04Ubuntu

Fixed in:5.3.0.1038.27USN-4887-1

linux-image-serverUbuntu

Fixed in:3.13.0.185.194USN-4889-1

linux-image-snapdragonUbuntu

Fixed in:4.4.0.1152.144USN-4883-1

Fixed in:4.15.0.1098.101USN-4883-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-virtualUbuntu

Fixed in:3.13.0.185.194USN-4889-1

Fixed in:4.4.0.206.212USN-4883-1

Fixed in:4.15.0.139.126USN-4883-1

Fixed in:5.4.0.70.73USN-4887-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.139.134USN-4883-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.70.78~18.04.63USN-4887-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.48.54~20.04.32USN-4887-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.206.179USN-4889-1

linux-kvmUbuntu

Fixed in:4.4.0-1090.99USN-4883-1

Fixed in:4.15.0-1087.89USN-4883-1

Fixed in:5.4.0-1036.37USN-4887-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-206.238~14.04.1USN-4889-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1019.20USN-4887-1

linux-oem-5.6Ubuntu

Fixed in:5.6.0-1052.56USN-4887-1

linux-oracleUbuntu

Fixed in:4.15.0-1067.75~16.04.1USN-4883-1

Fixed in:4.15.0-1067.75USN-4883-1

Fixed in:5.4.0-1041.44USN-4887-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1041.44~18.04.1USN-4887-1

linux-raspiUbuntu

Fixed in:5.4.0-1032.35USN-4887-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1032.35~18.04.1USN-4887-1

linux-raspi2Ubuntu

Fixed in:4.4.0-1148.158USN-4883-1

Fixed in:4.15.0-1081.86USN-4883-1

linux-raspi2-5.3Ubuntu

Fixed in:5.3.0-1038.40USN-4887-1

linux-snapdragonUbuntu

Fixed in:4.4.0-1152.162USN-4883-1

Fixed in:4.15.0-1098.107USN-4883-1

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

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.08%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Patch3

Exploit1

blog.grimm-co.com

Third-Party Advisory6

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

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CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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.