CVE-2025-40284

Kernel crash via uncanceled Bluetooth mesh timer

Published Dec 6, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel Bluetooth MGMT mesh handling allows local users to crash the kernel during HCI device removal. The mgmt_index_removed function frees an HCI device without synchronously canceling its pending mesh_send_done work, so the timer later accesses released memory. A local user able to drive the Bluetooth MGMT mesh path and remove the device can trigger the crash; no data disclosure or modification is established.

CVSS severity7.0
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel Bluetooth MGMT mesh handling allows local users to crash the kernel during HCI device removal. The mgmt_index_removed function frees an HCI device without synchronously canceling its pending mesh_send_done work, so the timer later accesses released memory. A local user able to drive the Bluetooth MGMT mesh path and remove the device can trigger the crash; no data disclosure or modification is established.

The record

CVE
CVE-2025-40284
Published
Dec 6, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=6.1
  2. Affected versionversion=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <2927ff643607eddf4f03d10ef80fe10d977154aa
  3. Affected versionversion=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <55fb52ffdd62850d667ebed842815e072d3c9961
  4. Affected versionversion=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <7b6b6c077cad0601d62c3c34ab7ce3fb25deda7b
  5. Affected versionversion=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <990e6143b0ca0c66f099d67d00c112bf59b30d76
  6. Affected versionversion=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <fd62ca5ad136dcf6f5aa308423b299a6be6f54ea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <2927ff643607eddf4f03d10ef80fe10d977154aa; version=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <55fb52ffdd62850d667ebed842815e072d3c9961; version=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <7b6b6c077cad0601d62c3c34ab7ce3fb25deda7b; version=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <990e6143b0ca0c66f099d67d00c112bf59b30d76; version=b338d91703fae6f6afd67f3f75caa3b8f36ddef3 <fd62ca5ad136dcf6f5aa308423b299a6be6f54ea

Published CVSS scores

7.0OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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.

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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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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