CVE-2026-46140

Kernel-memory disclosure via unchecked WMT response length

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds read in the btmtk Bluetooth driver in Linux Kernel allows local users to disclose kernel memory or crash the system. btmtk_usb_hci_wmt_sync() casts response data to seven- and nine-byte WMT event structures without first verifying that the SKB contains those bytes. The flaw is reached when MediaTek Bluetooth firmware returns a truncated WMT event; the bounded consequences are memory disclosure or a kernel crash.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in the btmtk Bluetooth driver in Linux Kernel allows local users to disclose kernel memory or crash the system. btmtk_usb_hci_wmt_sync() casts response data to seven- and nine-byte WMT event structures without first verifying that the SKB contains those bytes. The flaw is reached when MediaTek Bluetooth firmware returns a truncated WMT event; the bounded consequences are memory disclosure or a kernel crash.

The record

CVE
CVE-2026-46140
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.11
  2. Affected versionversion=d019930b0049fc2648a6b279893d8ad330596e81 <624fb79dadc1b65757986a9d0fdde5c0cf3fe179
  3. Affected versionversion=d019930b0049fc2648a6b279893d8ad330596e81 <634a4408c0615c523cf7531790f4f14a422b9206
  4. Affected versionversion=d019930b0049fc2648a6b279893d8ad330596e81 <70d37a8b9229e394cc17ddad47e90b81d80fcd09
  5. Affected versionversion=d019930b0049fc2648a6b279893d8ad330596e81 <c411cf1bfde951cfa821809cf4020ba177f76e0c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11; version=d019930b0049fc2648a6b279893d8ad330596e81 <624fb79dadc1b65757986a9d0fdde5c0cf3fe179; version=d019930b0049fc2648a6b279893d8ad330596e81 <634a4408c0615c523cf7531790f4f14a422b9206; version=d019930b0049fc2648a6b279893d8ad330596e81 <70d37a8b9229e394cc17ddad47e90b81d80fcd09; version=d019930b0049fc2648a6b279893d8ad330596e81 <c411cf1bfde951cfa821809cf4020ba177f76e0c

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo