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CVE-2024-53143

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fsnotify: Fix ordering of iput() and watched_objects decrement Ensure the superblock is kept alive until we're done with iput().

Published Dec 7, 2024CWE-416EPSS 0.21%

Overview

CVE-2024-53143 is a high-severity vulnerability. It was published on December 7, 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:

fsnotify: Fix ordering of iput() and watched_objects decrement

Ensure the superblock is kept alive until we're done with iput().

Holding a reference to an inode is not allowed unless we ensure the

superblock stays alive, which fsnotify does by keeping the

watched_objects count elevated, so iput() must happen before the

watched_objects decrement.

This can lead to a UAF of something like sb->s_fs_info in tmpfs, but the

UAF is hard to hit because race orderings that oops are more likely, thanks

to the CHECK_DATA_CORRUPTION() block in generic_shutdown_super().

Also, ensure that fsnotify_put_sb_watched_objects() doesn't call

fsnotify_sb_watched_objects() on a superblock that may have already been

freed, which would cause a UAF read of sb->s_fsnotify_info.

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/21d1b618b6b9da46c5116c640ac4b1cc8d40d63aRefgit.kernel.org/stable/c/45a8f8232a495221ed058191629f5c628f21601aRefgit.kernel.org/stable/c/83af1cfa10d9aafdabd06b3655e07727f373b434Refproject-zero.issues.chromium.org/issues/379667898

How CyberStrike helps

Frequently asked questions

What is CVE-2024-53143?

CVE-2024-53143 is a high-severity vulnerability. It was published on December 7, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-53143?

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-2024-53143?

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-2024-53143?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-53143 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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