# CVE-2019-8921: bluez: An issue was discovered in bluetoothd in BlueZ through 5.48

CVE-2019-8921 is fixed in 7 products on 1 platform, first by bluetooth 5.48-0ubuntu3.6, released November 29, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-8921
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0101
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 29, 2021

## Description

An issue was discovered in bluetoothd in BlueZ through 5.48. The vulnerability lies in the handling of a SVC_ATTR_REQ by the SDP implementation. By crafting a malicious CSTATE, it is possible to trick the server into returning more bytes than the buffer actually holds, resulting in leaking arbitrary heap data. The root cause can be found in the function service_attr_req of sdpd-request.c. The server does not check whether the CSTATE data is the same in consecutive requests, and instead simply trusts that it is the same.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bluetooth Ubuntu 18.04.6 LTS (bionic) | 5.48-0ubuntu3.6 | [bluetooth 5.48-0ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bluetooth-5.48-0ubuntu3.6.md) | Nov 29, 2021 |
| Linux | bluez Debian 12.15 (bookworm) | 5.54-1 | [DEBIAN-CVE-2019-8921](https://patchblox.com/security/data/fix/linux/debian-cve-2019-8921.md) | Nov 29, 2021 |
| Linux | bluez Debian 13.5 (trixie) | 5.54-1 | [DEBIAN-CVE-2019-8921](https://patchblox.com/security/data/fix/linux/debian-cve-2019-8921.md) | Nov 29, 2021 |
| Linux | bluez Debian 14 | 5.54-1 | [DEBIAN-CVE-2019-8921](https://patchblox.com/security/data/fix/linux/debian-cve-2019-8921.md) | Nov 29, 2021 |
| Linux | bluez Ubuntu 18.04.6 LTS (bionic) | 5.48-0ubuntu3.6 | [bluez 5.48-0ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bluez-5.48-0ubuntu3.6.md) | Nov 29, 2021 |
| Linux | bluez-cups Ubuntu 18.04.6 LTS (bionic) | 5.48-0ubuntu3.6 | [bluez-cups 5.48-0ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bluez-cups-5.48-0ubuntu3.6.md) | Nov 29, 2021 |
| Linux | bluez-hcidump Ubuntu 18.04.6 LTS (bionic) | 5.48-0ubuntu3.6 | [bluez-hcidump 5.48-0ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bluez-hcidump-5.48-0ubuntu3.6.md) | Nov 29, 2021 |
| Linux | bluez-obexd Ubuntu 18.04.6 LTS (bionic) | 5.48-0ubuntu3.6 | [bluez-obexd 5.48-0ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bluez-obexd-5.48-0ubuntu3.6.md) | Nov 29, 2021 |
| Linux | bluez-tests Ubuntu 18.04.6 LTS (bionic) | 5.48-0ubuntu3.6 | [bluez-tests 5.48-0ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-bluez-tests-5.48-0ubuntu3.6.md) | Nov 29, 2021 |
| Linux | libbluetooth3 Ubuntu 18.04.6 LTS (bionic) | 5.48-0ubuntu3.6 | [libbluetooth3 5.48-0ubuntu3.6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libbluetooth3-5.48-0ubuntu3.6.md) | Nov 29, 2021 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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