CVE-2026-80736
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 versions
Linux kernel versions
6.9
and later are affected. Fixed in
6.12.104,
6.18.45,
7.1.9,
7.2
and their respective stable series.
References
4 totalFrequently asked questions
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What is CVE-2026-80736?
CVE-2026-80736 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.9 onward and has been patched in 6.12.104, 6.18.45, 7.1.9 and others. CVE-2026-80736 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80736?
Yes. CVE-2026-80736 has been patched. Fixed versions include 6.12.104, 6.18.45, 7.1.9 and others. If you are running Linux kernel 6.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80736 actively exploited?
No. CVE-2026-80736 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.