Is CVE-2021-27363 in the CISA KEV catalog?

No. CVE-2021-27363 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-27363?

CVE-2021-27363 has a CVSS v3 base score of 4.4 (MEDIUM).

What is the EPSS score for CVE-2021-27363?

CVE-2021-27363 has an EPSS score of 0.71% (49th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-27363?

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

CVE & CISA-KEV Catalog

CVE-2021-27363

MEDIUM

4.4

CVSS v3

NVD

Description

An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module's global variables.

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.24-1CVE-2021-27363

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

ConfidentialityLow

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.71%probability of exploitation in 30 days

49thpercentile

Moderate risk: more likely to be exploited than 49% of all known CVEs.

References

Patch2

Exploit1

blog.grimm-co.com

Third-Party Advisory5

Embed a live status badge for CVE-2021-27363

Markdown

[![CVE-2021-27363](https://tridentstack.com/cve/badge/CVE-2021-27363.svg)](https://tridentstack.com/cve/CVE-2021-27363)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-27363"><img src="https://tridentstack.com/cve/badge/CVE-2021-27363.svg" alt="CVE-2021-27363"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.