Cloudanix VulnDB

CVE-2026-98819

None

CVSS

—

EPSS

0.2%

Published

Oct 18, 2026

CISA due date

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Cloudanix analysis

Next patch cycle SSVC: Track

A recent fix stops bad Bluetooth firmware data from slipping through checks on Linux systems and potentially breaking wireless connections.

Exploitation
Local Privilege
Attacker needs
Local User
Complexity
Moderate
Impact
Privilege Gain
Component
OS kernel
Class
Improper Input Validation
Remediation
Upgrade
Effort
Medium
Patch risk
Low

What it actually does

The flaw allows signed parsing of DDC record lengths so a value of 0xFF wraps, bypassing checks for records smaller than a three-byte header, larger than U8_MAX, or exceeding remaining firmware bytes before Intel_Write_DDC is called, enabling malformed input to reach firmware write logic.

Why it matters to the business

Linux systems using Intel Bluetooth hardware face risk of driver instability or crashes during firmware loading, disrupting wireless connectivity on servers, desktops, and embedded devices until the kernel is updated.

How an attack unfolds

An attacker with the ability to supply a crafted DDC firmware blob (via local firmware update path or malicious module) triggers the length parsing error to feed invalid records into Intel_Write_DDC, potentially causing memory corruption or denial of service in the btintel driver.

How to fix it

Upgrade the Linux kernel to a version containing the btintel DDC length validation fix; rebuild and reboot any affected systems; avoid loading untrusted firmware blobs until patched.

How to confirm the fix worked

Confirm the kernel source contains the unsigned length parse and explicit rejection of undersized, oversized, or truncated DDC records before Intel_Write_DDC; test by attempting to load a record with length 0xFF and verifying it is rejected.

Typical attack path

  1. Locate a Linux system with Intel Bluetooth and the vulnerable btintel driver
  2. Prepare a malformed DDC record that exploits the signed length wrap
  3. Trigger firmware loading through the Bluetooth stack or a user-space tool
  4. Bypass length validation and reach Intel_Write_DDC with invalid data
  5. Induce driver crash or memory corruption

How to detect it

Review kernel logs (dmesg, syslog) for btintel messages mentioning DDC records, Intel_Write_DDC failures, or length validation errors; search for unexpected Bluetooth firmware reload attempts.

What your security team should do

  • Prioritize kernel updates on all systems exposing Intel Bluetooth within the next patch cycle
  • Monitor kernel logs for btintel DDC parsing warnings after upgrade
  • Restrict local firmware loading privileges until systems are patched

The record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: btintel: validate DDC record lengths Parse DDC record lengths in unsigned storage so 0xFF does not wrap. Reject records smaller than the mandatory three-byte header, records exceeding U8_MAX, and records exceeding remaining firmware bytes before issuing Intel_Write_DDC. This issue was reported by Claude Mythos.

Affected packages

Ecosystem Package Introduced Fixed