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Vulnerability · Published Jun 8, 2021 · Assigned by redhat

CVE-2021-3564

Medium 5.5

In plain English

A medium-severity double free in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.5%top 58.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-tools-libs-devel4.18.0-348.el8ALSA-2021:4356
Debian:12linux5.10.46-1DEBIAN-CVE-2021-3564
Debian:13linux5.10.46-1DEBIAN-CVE-2021-3564
Debian:14linux5.10.46-1DEBIAN-CVE-2021-3564
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-3564
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-3564
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-3564

Affected products (as reported)

VendorProductVersions
n/a kernel All Linux kernel versions starting from 3.13

Weakness: CWE-415

References