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CVE-2026-31735

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: iommupt: Fix short gather if the unmap goes into a large mapping unmap has the odd behavior that it can unmap more than request…

Published May 1, 2026EPSS 0.17%

Overview

CVE-2026-31735 is a high-severity vulnerability. It was published on May 1, 2026 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:

iommupt: Fix short gather if the unmap goes into a large mapping

unmap has the odd behavior that it can unmap more than requested if the

ending point lands within the middle of a large or contiguous IOPTE.

In this case the gather should flush everything unmapped which can be

larger than what was requested to be unmapped. The gather was only

flushing the range requested to be unmapped, not extending to the extra

range, resulting in a short invalidation if the caller hits this special

condition.

This was found by the new invalidation/gather test I am adding in

preparation for ARMv8. Claude deduced the root cause.

As far as I remember nothing relies on unmapping a large entry, so this is

likely not a triggerable bug.

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/50ecd96a28f712f8b682c0441f4cb9b086d28816Refgit.kernel.org/stable/c/ee6e69d032550687a3422504bfca3f834c7b5061

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31735?

CVE-2026-31735 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-31735?

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-2026-31735?

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-2026-31735?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31735 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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