Cloudanix VulnDB

CVE-2026-98830

None

CVSS

—

EPSS

0.2%

Published

Oct 18, 2026

CISA due date

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Cloudanix analysis

Next patch cycle SSVC: Track

A bug in the Linux kernel's wireless driver can let bad data from a network device cause memory errors that might crash the computer or open a security hole.

Exploitation
Local Privilege
Attacker needs
Low Privilege
Complexity
Low
Impact
Data Exposure
Component
OS kernel
Class
Buffer Overflow
Remediation
Upgrade
Effort
Medium
Patch risk
Low

What it actually does

Unvalidated length field from firmware response allows memcpy in wfx_hif_read_mib to copy reply->length bytes into a caller buffer without ensuring it fits within val_len, producing an out-of-bounds read past the end of the allocated reply structure.

Why it matters to the business

Linux systems using the wfx wireless driver face risk of kernel memory corruption or crashes; although EPSS remains low at 0.002 with no known exploitation five days after disclosure, the issue still requires timely kernel updates to avoid operational disruption on affected hardware.

How an attack unfolds

An attacker who can trigger MIB read operations and influence the firmware reply (for example through hardware access or driver interaction) supplies an oversized length value, bypassing the dead -ENOMEM check and causing the kernel to read past the intended buffer boundary.

How to fix it

Apply the upstream fix that replaces the dead -ENOMEM check with an active validation ensuring reply->length fits inside val_len before the memcpy; rebuild or install the corrected kernel package for the wfx driver.

How to confirm the fix worked

Confirm the patched source contains the length comparison before memcpy; run regression tests exercising MIB read paths with both valid and oversized firmware responses; verify updated kernel packages are deployed across the fleet.

Typical attack path

  1. Locate a Linux system exposing the wfx wifi driver
  2. Cause the driver to invoke wfx_hif_read_mib
  3. Return a firmware response whose length field exceeds the caller's val_len
  4. Trigger out-of-bounds read during the unchecked memcpy

How to detect it

Inspect kernel logs and dmesg for wfx-related oops, warnings, or abnormal MIB read entries; correlate with any recent hardware or driver initialization events; no widespread exploitation artifacts are currently known.

What your security team should do

  • Prioritize kernel updates containing the wfx MIB length validation within the next maintenance window
  • Review systems for presence of wfx hardware and schedule targeted patching
  • Add kernel oops and wfx driver error monitoring to detect anomalous MIB handling

The record

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 packages

Ecosystem Package Introduced Fixed