CVE-2026-90089

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: btnxpuart: Validate the FW dump header length

nxp_process_fw_dump() pulls the ACL header off the frame and then reads

seq_num and buf_len from a struct nxp_fw_dump_hdr placed at skb->data,

without checking that the ACL payload is long enough to contain it.

h4_recv_buf() collects HCI_ACL_HDR_SIZE bytes of header followed by the

number of payload bytes named in that header, so skb->len is 4 + dlen

with dlen supplied by the controller and possibly smaller than the 8

byte dump header, or zero. A short frame with connection handle 0xfff

therefore reads both fields from beyond the received data.

Beyond the read itself, buf_len is what terminates a dump: a value of

zero makes the driver call hci_devcd_complete() and reset the

controller, so a truncated frame can end a dump early.

Use skb_pull_data() to validate and pull the FW dump header before

accessing its fields. Warn and reject the chunk if the header is

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References