CVE-2025-39982

Kernel memory corruption via Bluetooth connection race

Published Oct 15, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel Bluetooth allows adjacent attackers to corrupt kernel memory through Bluetooth connection events. A completion event can free a pending BT_OPEN hci_conn while hci_acl_create_conn_sync or hci_le_create_conn_sync continues command submission and accesses the reclaimed object. An unpaired device within radio range can time connection and abort events without user interaction, causing kernel memory corruption or a system crash.

CVSS severity8.8
High
EPSS probability0.28%
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 allows adjacent attackers to corrupt kernel memory through Bluetooth connection events. A completion event can free a pending BT_OPEN hci_conn while hci_acl_create_conn_sync or hci_le_create_conn_sync continues command submission and accesses the reclaimed object. An unpaired device within radio range can time connection and abort events without user interaction, causing kernel memory corruption or a system crash.

The record

CVE
CVE-2025-39982
Published
Oct 15, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 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=5.18
  2. Affected versionversion=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <484c7d571a3d1b3fd298fa691b660438c4548a53
  3. Affected versionversion=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <6243bda271a628c48875e3e473206e7f584892ce
  4. Affected versionversion=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <9e622804d57e2d08f0271200606bd1270f75126f
  5. Affected versionversion=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08
  6. Affected versionversion=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <bcce99f613163a43de24674b717e7a6c135fc879

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <484c7d571a3d1b3fd298fa691b660438c4548a53; version=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <6243bda271a628c48875e3e473206e7f584892ce; version=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <9e622804d57e2d08f0271200606bd1270f75126f; version=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08; version=aef2aa4fa98e18ea5d9345bf777ee698c8598728 <bcce99f613163a43de24674b717e7a6c135fc879

Published CVSS scores

8.8Linux kernel CVE teamCVSS:3.1/AV:A/AC:L/PR:N/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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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

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Your stack

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