CVE-2026-63947 Bluetooth: HIDP: fix missing length checks in hidp_input_report()
A missing length check in the Linux kernel Bluetooth HIDP driver allows out-of-bounds reads, potentially leaking memory or causing crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63947?
CVE-2026-63947 is a high-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-63947?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63947?
Apply the vendor's patch.
Is CVE-2026-63947 being exploited?
There is no known exploitation of CVE-2026-63947 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-63947, DEBIAN-CVE-2026-63947, GHSA-j4pv-6p78-8g93, ROOT-OS-DEBIAN-11-CVE-2026-63947, ROOT-OS-UBUNTU-2204-CVE-2026-63947, UBUNTU-CVE-2026-63947.