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CVE-2026-80736: thunderbolt: Fix bandwidth group reservation indexing

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-03 · updated 2026-09-04

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.

Affected products

• Linux kernel: 6.9 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0a8c9ed4f166216642a8c084f0de415169c88088
• https://git.kernel.org/stable/c/0bfb67ba366cd68d1d0ad935760577bae1d5df27
• https://git.kernel.org/stable/c/9977321835c7ae71d12a43bed7baa5bd514d01c3
• https://git.kernel.org/stable/c/d2ee4d47aacbd2ba456092eeec670dba35fde291

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