---
id: "CVE-2026-98830"
kind: "vulnerability"
aliases: ["CVE-2026-98830"]
title: "Linux kernel: wfx Wi-Fi driver overruns buffer on oversized firmware MIB reply"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "linux-kernel", "wfx", "wifi"]
not_affected_if: ["no-wfx-hardware"]
published_at: "2026-10-18T16:17:37+00:00"
first_seen_at: "2026-10-23T21:57:17+00:00"
updated_at: "2026-10-25T05:13:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98830", "first_seen_at": "2026-10-23T21:57:17+00:00"}]
---

# Linux kernel: wfx Wi-Fi driver overruns buffer on oversized firmware MIB reply

The wfx Wi-Fi driver copies a firmware MIB reply into a caller buffer without checking the reply length against the buffer size. A firmware response with an oversized length field overruns the caller buffer and reads past the reply allocation.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- Update the Linux kernel to a release that includes the wfx validation fix (kernel version unknown from sources)

## Timeline

- 2026-10-23T21:57:17+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-98830

## From the sources

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

wifi: wfx: validate MIB read length before copying to caller

wfx_hif_read_mib() copies reply->length bytes from the firmware
response into the caller-provided buffer without checking that
reply->length does not exceed val_len. A firmware response with
a length field larger than expected overruns the caller buffer and
reads past the end of the reply allocation.

Replace the dead -ENOMEM check with an active validation that
reply->length fits within val_len before the memcpy.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_