What’s Vulnerable › Vulnerabilities

CVE-2021-3564

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-08 · updated 2026-06-17
• Weakness: CWE-415

Description

A flaw double-free memory corruption in the Linux kernel HCI device initialization subsystem was found in the way user attach malicious HCI TTY Bluetooth device. A local user could use this flaw to crash the system. This flaw affects all the Linux kernel versions starting from 3.13.

Affected products

• Debian Linux: 9.0
• Fedoraproject Fedora: 34
• Linux kernel: from 3.13

References

• http://www.openwall.com/lists/oss-security/2021/05/25/1
• http://www.openwall.com/lists/oss-security/2021/06/01/2
• https://bugzilla.redhat.com/show_bug.cgi?id=1964139
• https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
• https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
• https://www.openwall.com/lists/oss-security/2021/05/25/1
• http://www.openwall.com/lists/oss-security/2021/05/25/1
• http://www.openwall.com/lists/oss-security/2021/06/01/2
• https://bugzilla.redhat.com/show_bug.cgi?id=1964139
• https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
• https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
• https://www.openwall.com/lists/oss-security/2021/05/25/1

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