CVE-2026-80736

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 < 0bfb67ba366cd68d1d0ad935760577bae1d5df27affected
LinuxLinux52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 < 9977321835c7ae71d12a43bed7baa5bd514d01c3affected
LinuxLinux52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 < 0a8c9ed4f166216642a8c084f0de415169c88088affected
LinuxLinux52a4490e89d7c4effe613d8dffd2ac0a2a786bd7 < d2ee4d47aacbd2ba456092eeec670dba35fde291affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.12.104 <= 6.12.*unaffected
LinuxLinux6.18.45 <= 6.18.*unaffected
LinuxLinux7.1.9 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References