CVE-2026-63947: Bluetooth: HIDP: fix missing length checks in hidp_input_report()

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-19 · updated 2026-10-28
Weakness: CWE-125

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.

Affected products

Linux kernel: from 2.6.12.1 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12 — fixed in 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12
Linux kernel: 2.6.12 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 5.15.210, 6.1.176, 6.6.143, 6.12.93; Linux kernel 7.1. Check the vendor advisory for mitigations.

References

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