CVE-2026-80736

HighCVSS 7.8/10Last modified Sep 4, 2026

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7, < 0bfb67ba366cd68d1d0ad935760577bae1d5df27; >= 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7, < 9977321835c7ae71d12a43bed7baa5bd514d01c3; >= 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7, < 0a8c9ed4f166216642a8c084f0de415169c88088; >= 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7, < d2ee4d47aacbd2ba456092eeec670dba35fde291
LinuxLinux6.9

References

Timeline

Published
Sep 3, 2026
Last modified
Sep 4, 2026
NVD status
Received

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CVE-2026-80736: High severity, CVSS 7.8 | Vulnix