CVE-2021-41229

Publication date 12 November 2021

Last updated 18 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bluez	25.10 questing	Fixed 5.62-0ubuntu2
	25.04 plucky	Fixed 5.62-0ubuntu2
	24.10 oracular	Fixed 5.62-0ubuntu2
	24.04 LTS noble	Fixed 5.62-0ubuntu2
	23.10 mantic	Fixed 5.62-0ubuntu2
	23.04 lunar	Fixed 5.62-0ubuntu2
	22.10 kinetic	Fixed 5.62-0ubuntu2
	22.04 LTS jammy	Fixed 5.62-0ubuntu2
	21.10 impish	Fixed 5.60-0ubuntu2.1
	21.04 hirsute	Fixed 5.56-0ubuntu4.3
	20.04 LTS focal	Fixed 5.53-0ubuntu3.4
	18.04 LTS bionic	Fixed 5.48-0ubuntu3.6
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Ignored end of standard support

Notes

sbeattie

introduced in d939483328489fb835bb425d36f7c7c73d52c388 (v4.0)

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
bluez	Upstream: ?id=e79

Severity score breakdown

Parameter	Value
Base score	4.3 · Medium
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

USN-5155-1
BlueZ vulnerabilities
23 November 2021