---
id: CVE-2026-98830
title: 'wifi: wfx: validate MIB read length before copying to caller'
summary: |-
  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 w…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-787
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff <
    819d4c1323e2a9b7329021d5367aa01add22b5dc
  - >-
    Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff <
    02886c18a340da59df57365f29009e1258bfe333
  - >-
    Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff <
    71d140099165de03128c00dd129f1eab21c6a3c4
  - >-
    Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff <
    7acb36fd60a3e7b858f12e69a919c3609b281408
  - >-
    Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff <
    ce67ebe9d8629776ce38e6995ae72fb903c828db
  - Linux 5.5
published: '2026-10-18'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:57:17.057Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98830'
references:
  - url: 'https://git.kernel.org/stable/c/819d4c1323e2a9b7329021d5367aa01add22b5dc'
  - url: 'https://git.kernel.org/stable/c/02886c18a340da59df57365f29009e1258bfe333'
  - url: 'https://git.kernel.org/stable/c/71d140099165de03128c00dd129f1eab21c6a3c4'
  - url: 'https://git.kernel.org/stable/c/7acb36fd60a3e7b858f12e69a919c3609b281408'
  - url: 'https://git.kernel.org/stable/c/ce67ebe9d8629776ce38e6995ae72fb903c828db'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98830.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98830'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555224'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98830'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98830'
  - url: 'https://kernelcve.org/list/?q=CVE-2026-98830'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.002
epssPercentile: 0.09734
ingestedAt: '2026-10-18T16:47:32.470Z'
---

## Overview

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.

## Affected

- `Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < 819d4c1323e2a9b7329021d5367aa01add22b5dc`
- `Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < 02886c18a340da59df57365f29009e1258bfe333`
- `Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < 71d140099165de03128c00dd129f1eab21c6a3c4`
- `Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < 7acb36fd60a3e7b858f12e69a919c3609b281408`
- `Linux >= f95a29d40782f4f0052a692a822de3ba044b19ff < ce67ebe9d8629776ce38e6995ae72fb903c828db`
- `Linux 5.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98830.json)