CVE-2025-68304

Kernel crash via Bluetooth connection teardown race

Published Dec 16, 2025 · Updated Dec 16, 2025

Use-after-free in the Linux kernel Bluetooth receive path allows physically proximate attackers to crash the host during connection teardown. The hdev lock/lookup/unlock/use sequence releases the device lock before protocol handlers use hci_conn, allowing another task to delete the object before l2cap_recv_acldata dereferences l2cap_data. Bluetooth must be connectable or advertising; crafted ACL, SCO, or ISO traffic can trigger a kernel panic without application-level authentication.

CVSS severity8.8
High
EPSS probability0.23%
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 the Linux kernel Bluetooth receive path allows physically proximate attackers to crash the host during connection teardown. The hdev lock/lookup/unlock/use sequence releases the device lock before protocol handlers use hci_conn, allowing another task to delete the object before l2cap_recv_acldata dereferences l2cap_data. Bluetooth must be connectable or advertising; crafted ACL, SCO, or ISO traffic can trigger a kernel panic without application-level authentication.

The record

CVE
CVE-2025-68304
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record 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=4d3ca4a9aaf0aa798a6be372dc0fc3a29e37dd57
  2. Affected versionversion=5af1f84ed13a416297ab9ced7537f4d5ae7f329a <79a2d4678ba90bdba577dc3af88cc900d6dcd5ee
  3. Affected versionversion=5af1f84ed13a416297ab9ced7537f4d5ae7f329a <ec74cdf77310c43b01b83ee898a9bd4b4b0b8e93
  4. Affected versionversion=6.6
  5. Affected versionversion=80265dd1d944c3f33e52375b5dbe654980bd2688
  6. Affected versionversion=cd55c13bbb3d093ae601aa97e588ed4c1390ebb1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4d3ca4a9aaf0aa798a6be372dc0fc3a29e37dd57; version=5af1f84ed13a416297ab9ced7537f4d5ae7f329a <79a2d4678ba90bdba577dc3af88cc900d6dcd5ee; version=5af1f84ed13a416297ab9ced7537f4d5ae7f329a <ec74cdf77310c43b01b83ee898a9bd4b4b0b8e93; version=6.6; version=80265dd1d944c3f33e52375b5dbe654980bd2688; version=cd55c13bbb3d093ae601aa97e588ed4c1390ebb1

Published CVSS scores

8.8CanonicalCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8LinuxCVSS: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.

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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Your stack

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