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CVE-2026-80736

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Fix bandwidth group reservation indexing Valid bandwidth group IDs range from 1 through MAX_GROUPS, while Group ID…

Published Sep 3, 2026EPSS 0.13%

Overview

CVE-2026-80736 is a high-severity vulnerability. It was published on September 3, 2026 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:

thunderbolt: Fix bandwidth group reservation indexing

Valid bandwidth group IDs range from 1 through MAX_GROUPS, while Group

ID 0 is reserved. tb_consumed_dp_bandwidth() uses the Group ID directly

to index its local group_reserved[] array.

The array currently has MAX_GROUPS entries, so its valid indices are 0

through MAX_GROUPS - 1. Group ID MAX_GROUPS therefore accesses one

element past the end, and the final group's reserved bandwidth is not

included when the array is summed.

Give group_reserved[] MAX_GROUPS + 1 entries so direct Group ID

indexing covers the reserved ID 0 and valid IDs 1 through MAX_GROUPS.

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/0a8c9ed4f166216642a8c084f0de415169c88088Refgit.kernel.org/stable/c/0bfb67ba366cd68d1d0ad935760577bae1d5df27Refgit.kernel.org/stable/c/9977321835c7ae71d12a43bed7baa5bd514d01c3Refgit.kernel.org/stable/c/d2ee4d47aacbd2ba456092eeec670dba35fde291

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80736?

CVE-2026-80736 is a high-severity vulnerability. It was published on September 3, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-80736?

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-2026-80736?

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-2026-80736?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80736 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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