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CVE-2021-46937

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()' DAMON debugfs interface increases the reference counts of…

Published Feb 27, 2024CWE-668EPSS 0.22%

Overview

CVE-2021-46937 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'

DAMON debugfs interface increases the reference counts of 'struct pid's

for targets from the 'target_ids' file write callback

('dbgfs_target_ids_write()'), but decreases the counts only in DAMON

monitoring termination callback ('dbgfs_before_terminate()').

Therefore, when 'target_ids' file is repeatedly written without DAMON

monitoring start/termination, the reference count is not decreased and

therefore memory for the 'struct pid' cannot be freed. This commit

fixes this issue by decreasing the reference counts when 'target_ids' is

written.

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/ebb3f994dd92f8fb4d70c7541091216c1e10cb71Refgit.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141Refgit.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71Refgit.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141

How CyberStrike helps

Frequently asked questions

What is CVE-2021-46937?

CVE-2021-46937 is a medium-severity vulnerability. It was published on February 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-46937?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-46937?

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-2021-46937?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-46937 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.

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