What is CVE-2026-80736?

CVE-2026-80736 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 6.9 onward and 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.

What is the CVSS score for CVE-2026-80736?

CVE-2026-80736 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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.

Is CVE-2026-80736 actively exploited?

CVE-2026-80736 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-80736

High

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.

Package Linux Kernel

Published 2026-09-03

Last modified 2026-09-04

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

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.

Affected from

≥ 6.9

Fixed in

✓ 6.12.104 6.12.x ✓ 6.18.45 6.18.x ✓ 7.1.9 7.1.x ✓ 7.2

References

4 total

Details

CVE ID CVE-2026-80736

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-09-03

Modified 2026-09-04

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-80736?

CVE-2026-80736 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . 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.
What is the CVSS score for CVE-2026-80736?

CVE-2026-80736 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
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.
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.