thunderbolt: Fix bandwidth group reservation indexing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80736
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-03 13:06:12 UTC
Updated2026-09-04 05:17:14 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001630000 probability, percentile 0.058020000 (date 2026-09-07)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 0bfb67ba366cd68d1d0ad935760577bae1d5df27 git Not specified
CNA Linux Linux affected 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 9977321835c7ae71d12a43bed7baa5bd514d01c3 git Not specified
CNA Linux Linux affected 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 0a8c9ed4f166216642a8c084f0de415169c88088 git Not specified
CNA Linux Linux affected 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 d2ee4d47aacbd2ba456092eeec670dba35fde291 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0bfb67ba366cd68d1d0ad935760577bae1d5df27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2ee4d47aacbd2ba456092eeec670dba35fde291 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a8c9ed4f166216642a8c084f0de415169c88088 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9977321835c7ae71d12a43bed7baa5bd514d01c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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