CVE-2021-41229— Memory leak in BlueZ
Quick assessment
Affected
bluez bluez
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
BlueZ是一款使用C语言编写的蓝牙协议堆栈，它主要用于提供对核心蓝牙层和协议的支持。 BlueZ 存在资源管理错误漏洞，该漏洞源于在受影响的版本中，sdp的cstate alloc buf中存在一个漏洞，它分配的内存总是挂起在cstate单链表中并且不会被释放，随着时间的推移这将导致内存泄漏。攻击者可利用该漏洞不断发送sdp包造成的，最终可能导致目标设备的服务崩溃。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-41229
Vulnerability Information
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Vulnerability Title
Memory leak in BlueZ
Source: CVE Program / CVE List V5
Vulnerability Description
BlueZ is a Bluetooth protocol stack for Linux. In affected versions a vulnerability exists in sdp_cstate_alloc_buf which allocates memory which will always be hung in the singly linked list of cstates and will not be freed. This will cause a memory leak over time. The data can be a very large object, which can be caused by an attacker continuously sending sdp packets and this may cause the service of the target device to crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
BlueZ 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BlueZ是一款使用C语言编写的蓝牙协议堆栈，它主要用于提供对核心蓝牙层和协议的支持。 BlueZ 存在资源管理错误漏洞，该漏洞源于在受影响的版本中，sdp的cstate alloc buf中存在一个漏洞，它分配的内存总是挂起在cstate单链表中并且不会被释放，随着时间的推移这将导致内存泄漏。攻击者可利用该漏洞不断发送sdp包造成的，最终可能导致目标设备的服务崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-41229
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-41229 (2)
Mailing List Discussions for CVE-2021-41229 (2)
IV. Related Vulnerabilities
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Same vendor: bluez
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CVE-2026-19774
BlueZ A2DP Stack-based Buffer Overflow Remote Code Execution -
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BlueZ HID over GATT Profile Improper Access Control Remote C -
CVE-2023-51596
BlueZ Phone Book Access Profile Heap-based Buffer Overflow R -
CVE-2023-51594
BlueZ OBEX Library Out-Of-Bounds Read Information Disclosure -
CVE-2023-51592
BlueZ Audio Profile AVRCP parse_media_folder Out-Of-Bounds R
Same weakness: CWE-400
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V. Comments for CVE-2021-41229
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