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CVE-2021-47433

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix abort logic in btrfs_replace_file_extents Error injection testing uncovered a case where we'd end up with a corrupt…

Published May 22, 2024EPSS 0.58%

Overview

CVE-2021-47433 is a high-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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

btrfs: fix abort logic in btrfs_replace_file_extents

Error injection testing uncovered a case where we'd end up with a

corrupt file system with a missing extent in the middle of a file. This

occurs because the if statement to decide if we should abort is wrong.

The only way we would abort in this case is if we got a ret !=

-EOPNOTSUPP and we called from the file clone code. However the

prealloc code uses this path too. Instead we need to abort if there is

an error, and the only error we _don't_ abort on is -EOPNOTSUPP and only

if we came from the clone file code.

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/0e309e1152fc34ef75991d9d69b165dbf75bf26cRefgit.kernel.org/stable/c/0e32a2b85c7d92ece86c17dfef390c5ed79c6378Refgit.kernel.org/stable/c/4afb912f439c4bc4e6a4f3e7547f2e69e354108fRefgit.kernel.org/stable/c/0e309e1152fc34ef75991d9d69b165dbf75bf26cRefgit.kernel.org/stable/c/0e32a2b85c7d92ece86c17dfef390c5ed79c6378Refgit.kernel.org/stable/c/4afb912f439c4bc4e6a4f3e7547f2e69e354108f

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47433?

CVE-2021-47433 is a high-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2021-47433?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47433?

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-2021-47433?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47433 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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