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CVE-2025-38688

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: iommufd: Prevent ALIGN() overflow When allocating IOVA the candidate range gets aligned to the target alignment.

Published Sep 4, 2025EPSS 0.17%

Overview

CVE-2025-38688 is a high-severity vulnerability. It was published on September 4, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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:

iommufd: Prevent ALIGN() overflow

When allocating IOVA the candidate range gets aligned to the target

alignment. If the range is close to ULONG_MAX then the ALIGN() can

wrap resulting in a corrupted iova.

Open code the ALIGN() using get_add_overflow() to prevent this.

This simplifies the checks as we don't need to check for length earlier

either.

Consolidate the two copies of this code under a single helper.

This bug would allow userspace to create a mapping that overlaps with some

other mapping or a reserved range.

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/79fad1917802c28de51a479318a056a6fbe3e2f2Refgit.kernel.org/stable/c/b42497e3c0e74db061eafad41c0cd7243c46436bRefgit.kernel.org/stable/c/d19b817540c0abe84854a64ee9ee34cecc3bbeefRefgit.kernel.org/stable/c/e42a046bb41dcdde4f766a17d8211842007ed537Refgit.kernel.org/stable/c/ebb6021560b94649bec6b8faba6fe0dca2218e81

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38688?

CVE-2025-38688 is a high-severity vulnerability. It was published on September 4, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-38688?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2025-38688?

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-2025-38688?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38688 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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