Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-47111

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: xen-netback: take a reference to the RX task thread Do this in order to prevent the task from being freed if the thread returns…

Published Mar 15, 2024CWE-416EPSS 0.24%

Overview

CVE-2021-47111 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

xen-netback: take a reference to the RX task thread

Do this in order to prevent the task from being freed if the thread

returns (which can be triggered by the frontend) before the call to

kthread_stop done as part of the backend tear down. Not taking the

reference will lead to a use-after-free in that scenario. Such

reference was taken before but dropped as part of the rework done in

2ac061ce97f4.

Reintroduce the reference taking and add a comment this time

explaining why it's needed.

This is XSA-374 / CVE-2021-28691.

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/107866a8eb0b664675a260f1ba0655010fac1e08Refgit.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4Refgit.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13eRefgit.kernel.org/stable/c/107866a8eb0b664675a260f1ba0655010fac1e08Refgit.kernel.org/stable/c/6b53db8c4c14b4e7256f058d202908b54a7b85b4Refgit.kernel.org/stable/c/caec9bcaeb1a5f03f2d406305355c853af10c13e

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47111?

CVE-2021-47111 is a high-severity vulnerability. It was published on March 15, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-47111?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47111?

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-2021-47111?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47111 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 HIGH CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999