thunderbolt: Fix bandwidth group reservation indexing (CVE-2026-80736) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80736

thunderbolt: Fix bandwidth group reservation indexing

Answer in brief

CVE-2026-80736 records a Unknown severity vulnerability in thunderbolt: Fix bandwidth group reservation indexing. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 3, 2026Updated Sep 3, 2026Source checked Sep 3, 2026First seen by HOL Sep 3, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 <0bfb67ba366cd68d1d0ad935760577bae1d5df27 \|\| >=52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 <9977321835c7ae71d12a43bed7baa5bd514d01c3 \|\| >=52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 <0a8c9ed4f166216642a8c084f0de415169c88088 \|\| >=52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 <d2ee4d47aacbd2ba456092eeec670dba35fde291	0bfb67ba366cd68d1d0ad935760577bae1d5df27, 9977321835c7ae71d12a43bed7baa5bd514d01c3, 0a8c9ed4f166216642a8c084f0de415169c88088, d2ee4d47aacbd2ba456092eeec670dba35fde291
Linux/Linuxgeneric	6.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0bfb67ba366cd68d1d0ad935760577bae1d5df27 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 3, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.