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CVE-2025-38058

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: __legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock ...

Published Jun 18, 2025CWE-667EPSS 0.17%

Overview

CVE-2025-38058 is a high-severity vulnerability. It was published on June 18, 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:

__legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock

... or we risk stealing final mntput from sync umount - raising mnt_count

after umount(2) has verified that victim is not busy, but before it

has set MNT_SYNC_UMOUNT; in that case __legitimize_mnt() doesn't see

that it's safe to quietly undo mnt_count increment and leaves dropping

the reference to caller, where it'll be a full-blown mntput().

Check under mount_lock is needed; leaving the current one done before

taking that makes no sense - it's nowhere near common enough to bother

with.

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/250cf3693060a5f803c5f1ddc082bb06b16112a9Refgit.kernel.org/stable/c/628fb00195ce21a90cf9e4e3d105cd9e58f77b40Refgit.kernel.org/stable/c/8cafd7266fa02e0863bacbf872fe635c0b9725ebRefgit.kernel.org/stable/c/9b0915e72b3cf52474dcee0b24a2f99d93e604a3Refgit.kernel.org/stable/c/b55996939c71a3e1a38f3cdc6a8859797efc9083Refgit.kernel.org/stable/c/b89eb56a378b7b2c1176787fc228d0a57172bdd5Refgit.kernel.org/stable/c/d8ece4ced3b051e656c77180df2e69e19e24edc1Refgit.kernel.org/stable/c/f6d45fd92f62845cbd1eb5128fd8f0ed7d0c5a42Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38058?

CVE-2025-38058 is a high-severity vulnerability. It was published on June 18, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38058?

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-2025-38058?

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-2025-38058?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38058 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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