CVE-2026-90089
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
In the Linux kernel, the btnxpuart Bluetooth driver's nxp_process_fw_dump() reads seq_num and buf_len from a firmware dump header struct at skb->data without verifying the ACL payload is long enough. A short frame with connection handle 0xfff reads both fields beyond the received data, and a buf_len of zero can end a dump early and reset the controller.
Risk Assessment
An out-of-bounds read may occur, and a remotely supplied truncated frame can trigger an unexpected Bluetooth controller reset.
Recommendation
Update the Linux kernel to a version with the fix that uses skb_pull_data() to validate and pull the FW dump header before accessing its fields and rejects truncated chunks.
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Original NVD description (English source)
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 truncated.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS