CVE intelligence

CVE-2021-3752

Vulnerability intelligence

Published Feb 16, 2022Sources checked Oct 21, 2026

7.1HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2021-3752 and is rated High severity with a CVSS score of 7.1. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Ubuntu Security Notices guidance

Vendor revision: Oct 13, 2026

This update corrects flaws in the following subsystems: - IPv6 networking; - Netfilter; (CVE-2026-53131)

CISA KEVNot listedBased on the latest collected catalog

EPSS1.7%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2021-3752?

A use-after-free flaw was found in the Linux kernel’s Bluetooth subsystem in the way user calls connect to the socket and disconnect simultaneously due to a race condition. This flaw allows a user to crash the system or escalate their privileges.

The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Source: NVD