What’s Vulnerable › Vulnerabilities

CVE-2021-41229: Memory leak in BlueZ

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-12 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• BlueZ: 5.58
• Debian Linux: 9.0, 10.0

References

• https://github.com/bluez/bluez/security/advisories/GHSA-3fqg-r8j5-f5xq
• https://lists.debian.org/debian-lts-announce/2021/11/msg00022.html
• https://lists.debian.org/debian-lts-announce/2022/10/msg00026.html
• https://security.netapp.com/advisory/ntap-20211203-0004/
• https://github.com/bluez/bluez/security/advisories/GHSA-3fqg-r8j5-f5xq
• https://lists.debian.org/debian-lts-announce/2021/11/msg00022.html
• https://lists.debian.org/debian-lts-announce/2022/10/msg00026.html
• https://lists.debian.org/debian-lts-announce/2024/09/msg00022.html
• https://security.netapp.com/advisory/ntap-20211203-0004/

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