Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-47427

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix iscsi_task use after free Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") added iscsi_…

Published May 21, 2024CWE-416EPSS 0.46%

Overview

CVE-2021-47427 is a critical-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

scsi: iscsi: Fix iscsi_task use after free

Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn")

added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but

then also changed the handling of the case where we detect an already

completed task where we now end up doing a goto to the common put/cleanup

code. This results in a iscsi_task use after free, because the common

cleanup code will do a put on the iscsi_task.

This reverts the goto and moves the iscsi_get_conn() to after we've checked

if the iscsi_task is valid.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93cRefgit.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6Refgit.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93cRefgit.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47427?

CVE-2021-47427 is a critical-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2021-47427?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47427?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47427?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47427 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related CRITICAL CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999