Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-47334

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev().

Published May 21, 2024CWE-416EPSS 0.28%

Overview

CVE-2021-47334 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

misc/libmasm/module: Fix two use after free in ibmasm_init_one

In ibmasm_init_one, it calls ibmasm_init_remote_input_dev().

Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are

allocated by input_allocate_device(), and assigned to

sp->remote.mouse_dev and sp->remote.keybd_dev respectively.

In the err_free_devices error branch of ibmasm_init_one,

mouse_dev and keybd_dev are freed by input_free_device(), and return

error. Then the execution runs into error_send_message error branch

of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called

to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev.

My patch add a "error_init_remote" label to handle the error of

ibmasm_init_remote_input_dev(), to avoid the uaf bugs.

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/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069Refgit.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25aRefgit.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00dRefgit.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720eRefgit.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbabRefgit.kernel.org/stable/c/7272b591c4cb9327c43443f67b8fbae7657dd9aeRefgit.kernel.org/stable/c/a7268e8a227d5a4f0bd1584f556246b0224ab274Refgit.kernel.org/stable/c/b9c87ce3bc6331f82811a8cf8e930423c22523a3Refgit.kernel.org/stable/c/ef1067d2baa847d53c9988510d99fb494de4d12cRefgit.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47334?

CVE-2021-47334 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47334?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2021-47334?

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-2021-47334?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47334 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