CVE-2026-63947
Received Received - Intake

Bluetooth Out-of-Bounds Read in Linux Kernel Bluetooth HIDP

Publication date: 2026-07-19

Last updated on: 2026-07-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: fix missing length checks in hidp_input_report() hidp_input_report() reads keyboard and mouse payload data from an skb without first verifying that skb->len contains enough data. hidp_recv_intr_frame() pulls the 1-byte HIDP header before dispatching to hidp_input_report(). If a paired device sends a truncated packet, the handler reads beyond the valid skb data, resulting in an out-of-bounds read of skb data. The OOB bytes may be interpreted as phantom key presses or spurious mouse movement. Replace the open-coded length tracking and pointer arithmetic with skb_pull_data() calls. skb_pull_data() returns NULL if the requested bytes are not present, eliminating the need for a manual size variable and the separate skb->len guard.

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Meta Information

Published
2026-07-19
Last Modified
2026-07-19
Generated
2026-07-20
AI Q&A
2026-07-19
EPSS Evaluated
N/A
NVD
CVE-2026-63947
EUVD
EUVD-2026-45720

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

Helpful Resources

Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is in the Linux kernel's Bluetooth HIDP (Human Interface Device Protocol) component. The issue occurs in the hidp_input_report() function, which processes keyboard and mouse data from Bluetooth devices. The function reads payload data without first checking if the data length is sufficient, leading to an out-of-bounds read if a paired device sends a truncated packet. This can cause phantom key presses or spurious mouse movements.

Detection Guidance

This vulnerability involves Bluetooth HIDP protocol handling in the Linux kernel. Detection requires checking kernel logs for Bluetooth-related errors or examining network traffic for malformed HIDP packets. No specific commands are provided in the context to detect this issue.

Impact Analysis

If exploited, this vulnerability could allow an attacker to send maliciously crafted Bluetooth packets to a vulnerable system, causing unintended keyboard inputs or mouse movements. This might lead to unauthorized actions, data exfiltration, or system compromise, depending on the attacker's goals.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR or HIPAA if exploited to inject phantom key presses or spurious mouse movements, as it may lead to unauthorized data access or manipulation. However, the provided CVE details do not explicitly address compliance implications.

Mitigation Strategies

Update your Linux kernel to the patched version that includes the fix for CVE-2026-63947. Disable Bluetooth HIDP functionality if not needed. Monitor Bluetooth device connections for suspicious activity.

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