Advisory Published

USN-4989-1: BlueZ vulnerabilities

First published: Wed Jun 16 2021(Updated: )

It was discovered that BlueZ incorrectly checked certain permissions when pairing. A local attacker could possibly use this issue to impersonate devices. (CVE-2020-26558) Jay LV discovered that BlueZ incorrectly handled redundant disconnect MGMT events. A local attacker could use this issue to cause BlueZ to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-27153) Ziming Zhang discovered that BlueZ incorrectly handled certain array indexes. A local attacker could use this issue to cause BlueZ to crash, resulting in a denial of service, or possibly obtain sensitive information. This issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10. (CVE-2021-3588)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libbluetooth3<5.56-0ubuntu4.1
5.56-0ubuntu4.1
=21.04
All of
ubuntu/bluez<5.56-0ubuntu4.1
5.56-0ubuntu4.1
=21.04
All of
ubuntu/libbluetooth3<5.55-0ubuntu1.2
5.55-0ubuntu1.2
=20.10
All of
ubuntu/bluez<5.55-0ubuntu1.2
5.55-0ubuntu1.2
=20.10
All of
ubuntu/libbluetooth3<5.53-0ubuntu3.2
5.53-0ubuntu3.2
=20.04
All of
ubuntu/bluez<5.53-0ubuntu3.2
5.53-0ubuntu3.2
=20.04
All of
ubuntu/libbluetooth3<5.48-0ubuntu3.5
5.48-0ubuntu3.5
=18.04
All of
ubuntu/bluez<5.48-0ubuntu3.5
5.48-0ubuntu3.5
=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this security advisory?

    The vulnerability ID of this security advisory is USN-4989-1.

  • What is the severity of CVE-2020-26558?

    The severity of CVE-2020-26558 is not specified in the security advisory.

  • What is the severity of CVE-2020-27153?

    The severity of CVE-2020-27153 is not specified in the security advisory.

  • How do I fix the BlueZ vulnerabilities?

    To fix the BlueZ vulnerabilities, you should update the affected software to the recommended versions mentioned in the security advisory.

  • Where can I find more information about the BlueZ vulnerabilities?

    You can find more information about the BlueZ vulnerabilities in the references section of the security advisory.

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