CVE-2021-3564
MEDIUMCVSS 5.5/10EPSS 0.48%
Last modified
CVE-2021-3564 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.48% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.13 |
| Fedoraproject | Fedora | 34 |
| Debian | Debian Linux | 9.0 |
References
- http://www.openwall.com/lists/oss-security/2021/05/25/1Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/06/01/2Exploit, Mailing List
- https://bugzilla.redhat.com/show_bug.cgi?id=1964139Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlThird Party Advisory
- https://www.openwall.com/lists/oss-security/2021/05/25/1Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/25/1Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/06/01/2Exploit, Mailing List
- https://bugzilla.redhat.com/show_bug.cgi?id=1964139Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlThird Party Advisory
- https://www.openwall.com/lists/oss-security/2021/05/25/1Exploit, Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3564?
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.
How severe is CVE-2021-3564?
CVE-2021-3564 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3564?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3564?
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Scan your code nowSource: NVD / NIST