Live › vulnerability › CVE-2026-98461
Go to dashboardThe Linux kernel Bluetooth HCI socket filter reads event bytes before checking the packet length, so a malformed event from a controller or vhci device can cause an out-of-bounds read. The sources describe a read of memory outside the packet; they do not state a confirmed code execution or data leak.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Systems running a Linux kernel with Bluetooth HCI socket support and a configured HCI opcode filter, where a malformed event can reach the host from a Bluetooth controller or a vhci device. The sources do not list fixed kernel versions. Systems without Bluetooth hardware or without the HCI socket in use are likely unaffected, but the sources do not say this explicitly.
No product ranges from the sources yet.
Unknown from the sources.
Unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_sock: validate event length before filtering
is_filtered_packet() reads the event code from skb->data[0] without first checking that the skb is nonempty. When an opcode filter is configured, it also reads the command opcode at offsets 3 or 4 without checking that a Command Complete or Command Status event is long enough.
hci_send_to_sock() invokes the filter before hci_event_packet() validates the event header. A malformed event supplied by a controller or a vhci device can therefore cause an out-of-bounds read.
Keep the unmasked event code for the opcode checks. The masked value is needed for the 64-bit event bitmap, but using it to identify command events aliases event codes above 0x3f. In particular, Synchronous Train Complete (0x4f) was treated as Command Status (0x0f) even though its payload has no opcode.
Reject actual command events that are too short for the field being inspected. A truncated command event cannot match a configured opcode.
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