CVE-2026-98291
Received Received - Intake

Bluetooth Off-by-One in Linux Kernel Bluetooth Stack

Publication date: 2026-10-06

Last updated on: 2026-10-06

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel_pcie: fix off-by-one bounds check in RX submit btintel_pcie_submit_rx() used frbd_index > rxq->count to guard the FRBD array access, allowing frbd_index == rxq->count to pass through and index one element past the end of the array. Change the check to >= rxq->count so every out-of-range index is rejected. This issue was reported by Claude Mythos.

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Meta Information

Published
2026-10-06
Last Modified
2026-10-06
Generated
2026-10-06
AI Q&A
2026-10-06
EPSS Evaluated
N/A
NVD
CVE-2026-98291
EUVD
EUVD-2026-93219

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
Linux Linux c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
Linux Linux c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
Linux Linux c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
Linux Linux c2b636b3f788d10486a6691ad6dd3ec4c93bd78e
Linux Linux 6.10

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Bluetooth driver vulnerability in the Linux kernel where a bounds check in the btintel_pcie_submit_rx function allows an array index to exceed the valid range. The check incorrectly permitted frbd_index to equal rxq->count, leading to an out-of-bounds write one element past the end of the FRBD array.

Detection Guidance

This vulnerability is specific to the Linux kernel's Bluetooth subsystem, particularly the btintel_pcie driver. Detection requires checking the kernel version and examining the btintel_pcie driver code for the off-by-one error in btintel_pcie_submit_rx(). No direct network or system commands are provided in the context to detect this issue.

Impact Analysis

This vulnerability could allow an attacker to corrupt kernel memory, potentially causing system crashes, privilege escalation, or unauthorized code execution. It specifically affects systems using the btintel_pcie Bluetooth driver in the Linux kernel.

Mitigation Strategies

Apply the latest kernel update that includes the fix for this vulnerability. Monitor your Linux distribution's security advisories for patches. If you are running a vulnerable kernel version, update to a patched version immediately to prevent potential buffer overflow exploits in the Bluetooth subsystem.

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