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CVE-2025-38627

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic The decompress_io_ctx may be released asynchronously after I/O comp…

Published Aug 22, 2025CWE-416EPSS 0.17%

Overview

CVE-2025-38627 is a high-severity vulnerability. It was published on August 22, 2025 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:

f2fs: compress: fix UAF of f2fs_inode_info in f2fs_free_dic

The decompress_io_ctx may be released asynchronously after

I/O completion. If this file is deleted immediately after read,

and the kworker of processing post_read_wq has not been executed yet

due to high workloads, It is possible that the inode(f2fs_inode_info)

is evicted and freed before it is used f2fs_free_dic.

The UAF case as below:

Thread A Thread B

- f2fs_decompress_end_io

- f2fs_put_dic

- queue_work

add free_dic work to post_read_wq

- do_unlink

- iput

- evict

- call_rcu

This file is deleted after read.

Thread C kworker to process post_re

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/39868685c2a94a70762bc6d77dc81d781d05bff5Refgit.kernel.org/stable/c/5d604d40cd3232b09cb339941ef958e49283ed0aRefgit.kernel.org/stable/c/74cbeeca4f16823ba58c882e1d8b836c0e39c93dRefgit.kernel.org/stable/c/8fae5b6addd5f6895e03797b56e3c7b9f9cd15c9Refgit.kernel.org/stable/c/cc81768212cdc509e5a986274db7bc24d18cde19

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38627?

CVE-2025-38627 is a high-severity vulnerability. It was published on August 22, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38627?

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-2025-38627?

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-2025-38627?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38627 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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