CVE-2022-3637

Local btmon crash via premature library unload

Published Oct 21, 2022 · Updated Apr 15, 2025

Denial of service in BlueZ btmon allows local users to crash the monitor process when initializing the J-Link RTT backend. The jlink_init function calls dlclose after resolving J-Link symbols, unloading a shared library whose symbols remain in use. Exploitation requires local low-privileged access, a J-Link RTT setup, and invocation of btmon's J-Link option; the bounded consequence is a btmon crash.

CVSS severity2.6
Low
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in BlueZ btmon allows local users to crash the monitor process when initializing the J-Link RTT backend. The jlink_init function calls dlclose after resolving J-Link symbols, unloading a shared library whose symbols remain in use. Exploitation requires local low-privileged access, a J-Link RTT setup, and invocation of btmon's J-Link option; the bounded consequence is a btmon crash.

The record

CVE
CVE-2022-3637
Published
Oct 21, 2022
Updated
Apr 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-404, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=n/a

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.6VulDB CNACVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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

CWE-404Improper Resource Shutdown or Release
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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