CVE-2024-22099Network attack vector

System crash via delayed RFCOMM security response

Published Jan 25, 2024 · Updated May 12, 2026

NULL pointer dereference in the Linux kernel Bluetooth RFCOMM driver allows remote authenticated users to crash affected systems. A delayed HCI encryption-key-size response can arrive after RFCOMM and L2CAP disconnect, leaving rfcomm_check_security to dereference a released connection. Exploitation requires low privileges and precise Bluetooth connection timing; the resulting null dereference interrupts availability by crashing the kernel.

CVSS severity6.3
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel Bluetooth RFCOMM driver allows remote authenticated users to crash affected systems. A delayed HCI encryption-key-size response can arrive after RFCOMM and L2CAP disconnect, leaving rfcomm_check_security to dereference a released connection. Exploitation requires low privileges and precise Bluetooth connection timing; the resulting null dereference interrupts availability by crashing the kernel.

The record

CVE
CVE-2024-22099
Published
Jan 25, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-476, CAPEC-100, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 25, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linux Kernelversion=v2.6.12-rc2 <v6.8-rc1

Published CVSS scores

6.3OpenAnolisCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.3Siemens ProductCERTCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CAPEC-100Overflow Buffers
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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