What is CVE-2021-3752?

CVE-2021-3752 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.1/10. Published 2022-02-16.

How severe is CVE-2021-3752?

High severity. CVSS v3 base score is 7.1 out of 10.

Is CVE-2021-3752 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Use After Free in Linux Kernel

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.

Vulnerability class: Use-After-Free

Published 2022-02-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (77.7th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
lore.kernel.org/lkml/20211115165435.133245729@linuxfoundation.org/
www.openwall.com/lists/oss-security/2021/09/15/4 (Exploit, Mailing List, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/03/msg00011.html (mailing-list, Mailing List, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/03/msg00012.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2022/dsa-5096 (vendor-advisory, Third Party Advisory)
www.oracle.com/security-alerts/cpujul2022.html (Patch, Third Party Advisory)
security.netapp.com/advisory/ntap-20220318-0009/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-3752?: CVE-2021-3752 is a high-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 7.1/10. Published 2022-02-16.
How severe is CVE-2021-3752?: High severity. CVSS v3 base score is 7.1 out of 10.
Is CVE-2021-3752 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.