Linux Kernel up to 6.12.103/6.18.44/7.1.8 thunderbolt tb_consumed_dp_bandwidth memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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8.1$0-$5k0.00

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 6.12.103/6.18.44/7.1.8. Impacted is the function tb_consumed_dp_bandwidth of the component thunderbolt. Performing a manipulation results in memory corruption. This vulnerability is reported as CVE-2026-80736. The attack requires a local approach. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.103/6.18.44/7.1.8. It has been classified as very critical. This affects the function tb_consumed_dp_bandwidth of the component thunderbolt. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-80736 since 08/26/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/07/2026).

The vulnerability scanner Nessus provides a plugin with the ID 343049 (Oracle Linux 9 : Unbreakable Enterprise kernel (ELSA-2026-500248)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.104, 6.18.45 or 7.1.9 eliminates this vulnerability. Applying the patch 0bfb67ba366cd68d1d0ad935760577bae1d5df27/9977321835c7ae71d12a43bed7baa5bd514d01c3/0a8c9ed4f166216642a8c084f0de415169c88088/d2ee4d47aacbd2ba456092eeec670dba35fde291 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (343049). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.3
VulDB Meta Temp Score: 8.1

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 343049
Nessus Name: Oracle Linux 9 : Unbreakable Enterprise kernel (ELSA-2026-500248)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.104/6.18.45/7.1.9
Patch: 0bfb67ba366cd68d1d0ad935760577bae1d5df27/9977321835c7ae71d12a43bed7baa5bd514d01c3/0a8c9ed4f166216642a8c084f0de415169c88088/d2ee4d47aacbd2ba456092eeec670dba35fde291

Timelineinfo

08/26/2026 CVE reserved
09/03/2026 +8 days Advisory disclosed
09/03/2026 +0 days VulDB entry created
09/07/2026 +3 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80736 (🔒)
GCVE (CVE): GCVE-0-2026-80736
GCVE (VulDB): GCVE-100-398337

Entryinfo

Created: 09/03/2026 10:52
Updated: 09/07/2026 01:17
Changes: 09/03/2026 10:52 (59), 09/05/2026 12:36 (2), 09/07/2026 01:17 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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