PatchSiren cyber security CVE debrief

CVE-2026-90089 Linux CVE debrief

A vulnerability in the Linux kernel's Bluetooth btnxpuart driver has been resolved. The nxp_process_fw_dump() function did not validate the FW dump header length, potentially leading to reads beyond the received data. This could result in a truncated frame ending a dump early. The issue has been addressed by using skb_pull_data() to validate and pull the FW dump header before accessing its fields.

Vendor: Linux
Product: Unknown
CVSS: HIGH 7.1
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-09-17
Original CVE updated: 2026-09-18
Advisory published: 2026-09-17
Advisory updated: 2026-09-18

Who should care

Linux kernel developers and maintainers, Bluetooth btnxpuart driver users, and Linux distribution maintainers should assess exposure and verify the integrity of the FW dump header.

Why it matters

A vulnerability in the Linux kernel's Bluetooth btnxpuart driver has been resolved. The issue could potentially lead to reads beyond the received data and end a dump early. Linux kernel developers and maintainers, Bluetooth btnxpuart driver users, and Linux distribution maintainers should assess exposure and verify the integrity of the FW dump header.

Verify FW dump header integrity to prevent potential issues with Bluetooth connections
Review and apply patches to ensure the Linux kernel's Bluetooth btnxpuart driver is up-to-date

Technical summary

The nxp_process_fw_dump() function in the Linux kernel's Bluetooth btnxpuart driver did not validate the FW dump header length. This could lead to reads beyond the received data and potentially end a dump early. The issue has been addressed by using skb_pull_data() to validate and pull the FW dump header before accessing its fields. Linux kernel developers and maintainers should assess exposure and verify the integrity of the FW dump header to prevent potential issues with Bluetooth connections. The vulnerability was resolved by validating the FW dump header length.

Defensive priority

Medium

Recommended defensive actions

Review and apply the patch to validate FW dump header length in the Linux kernel's Bluetooth btnxpuart driver
Verify the integrity of the FW dump header before accessing its fields
Monitor for potential issues with Bluetooth connections
Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
Review compensating controls for exposed systems while remediation is scheduled and verified
Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability. Three source references from the Linux kernel Git repository are also available. Additional details from source references indicate that the vulnerability was addressed by using skb_pull_data() to validate and pull the FW dump header before accessing its fields. Linux kernel developers and maintainers should verify the integrity of the FW dump header to prevent potential issues with Bluetooth connections. The issue could potentially lead to and

Sources and references

Verified primary and authoritative sources

CVE-2026-90089 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-90089

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-90089 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-90089

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Source reference
Unverified legacy reference

URL: https://git.kernel.org/stable/c/060fa7592bdc043a93b6b7870f5b8551206d315d

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Source reference
Unverified legacy reference

URL: https://git.kernel.org/stable/c/22d419db7f9a01bea22cfcf66774d2b2fd4bb354

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Source reference
Unverified legacy reference

URL: https://git.kernel.org/stable/c/a644b8df94966b672ac656577df98bd01bc88393

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.