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CVE-2024-46840

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: btrfs: clean up our handling of refs == 0 in snapshot delete In reada we BUG_ON(refs == 0), which could be unkind since we aren…

Published Sep 27, 2024EPSS 0.26%

Overview

CVE-2024-46840 is a medium-severity vulnerability. It was published on September 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:

btrfs: clean up our handling of refs == 0 in snapshot delete

In reada we BUG_ON(refs == 0), which could be unkind since we aren't

holding a lock on the extent leaf and thus could get a transient

incorrect answer. In walk_down_proc we also BUG_ON(refs == 0), which

could happen if we have extent tree corruption. Change that to return

-EUCLEAN. In do_walk_down() we catch this case and handle it correctly,

however we return -EIO, which -EUCLEAN is a more appropriate error code.

Finally in walk_up_proc we have the same BUG_ON(refs == 0), so convert

that to proper error handling. Also adjust the error message so we can

actually do something with the information.

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/03804641ec2d0da4fa088ad21c88e703d151ce16Refgit.kernel.org/stable/c/71291aa7246645ef622621934d2067400380645eRefgit.kernel.org/stable/c/728d4d045b628e006b48a448f3326a7194c88d32Refgit.kernel.org/stable/c/7d1df13bf078ffebfedd361d714ff6cee1ff01b9Refgit.kernel.org/stable/c/9cc887ac24b7a0598f4042ae9af6b9a33072f75bRefgit.kernel.org/stable/c/b8ccef048354074a548f108e51d0557d6adfd3a3Refgit.kernel.org/stable/c/c60676b81fab456b672796830f6d8057058f029cRefgit.kernel.org/stable/c/c847b28a799733b04574060ab9d00f215970627dReflists.debian.org/debian-lts-announce/2024/10/msg00003.htmlReflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-46840?

CVE-2024-46840 is a medium-severity vulnerability. It was published on September 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-46840?

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-2024-46840?

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-2024-46840?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-46840 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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