Riskcovery

CVE-2026-80736

thunderbolt: Fix bandwidth group reservation indexing

State
Published
Severity
7.8 High
Published
Sep 3, 2026
Updated
Sep 4, 2026
Reserved
Aug 26, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 to before 0bfb67ba366cd68d1d0ad935760577bae1d5df27Affected
  • 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 to before 9977321835c7ae71d12a43bed7baa5bd514d01c3Affected
  • 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 to before 0a8c9ed4f166216642a8c084f0de415169c88088Affected
  • 52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 to before d2ee4d47aacbd2ba456092eeec670dba35fde291Affected
LinuxLinux
  • 6.9Affected
  • before 6.9Not affected
  • 6.12.104 through 6.12.*Not affected
  • 6.18.45 through 6.18.*Not affected
  • 7.1.9 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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