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CVE-2026-80749

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: drm/connector/hdmi: Fix out of bounds memory read A helper function was copying a given audio infoframe into the connector's co…

Published Sep 3, 2026EPSS 0.12%

Overview

CVE-2026-80749 is a high-severity vulnerability. It was published on September 3, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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:

drm/connector/hdmi: Fix out of bounds memory read

A helper function was copying a given audio infoframe into the

connector's copy but using the size of the destination (a generic

target, sized to accept many different data blocks) not the source (a

very specific type of data block). Thus, it was copying 60 bytes of

data from a 28 byte allocation.

Fix that by using the source size instead, together with a build bug

on the source size actually being smaller than the destination.

I hit this running KUnit tests under KASAN (while debugging something

else entirely). In the real world, it seems unlikely to cause an

actual problem. It is a read not a write so it can't corrupt any

memory. However, it could potentially fall off the end of a page and

cause an accvio 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/9ecf8ba763d0ffe0673538eb4bf7806f20455d19Refgit.kernel.org/stable/c/d9f7454c185c0c7f0973e11d62ad6c06862c324cRefgit.kernel.org/stable/c/e5b527804a1ea4f70e139179d3062cf5de8c06abRefgit.kernel.org/stable/c/f72bb95732bc5ca87b50c52c8f087ba501950809

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80749?

CVE-2026-80749 is a high-severity vulnerability. It was published on September 3, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-80749?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-80749?

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-2026-80749?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80749 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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