{"cve":"CVE-2021-3564","nvd":{"published":"2021-06-08T12:15:11.753","modified":"2026-06-17T04:05:21.150","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-415"],"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"],"products":["debian:debian_linux","fedoraproject:fedora","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-3564","score":0.00485,"percentile":0.41792,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}