CVE-2021-3752

Name: CVE-2021-3752
Creator: NVD / NIST
Published: 2022-02-16T19:15:08.587+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2021-3752 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 1.75% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.1/10

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.75%

75.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 2.6.12, < 4.4.293
Linux	Linux Kernel	>= 4.5, < 4.9.291
Linux	Linux Kernel	>= 4.10, < 4.14.256
Linux	Linux Kernel	>= 4.15, < 4.19.218
Linux	Linux Kernel	>= 4.20, < 5.4.160
Linux	Linux Kernel	>= 5.5, < 5.10.80
Linux	Linux Kernel	>= 5.11, < 5.14.19
Linux	Linux Kernel	>= 5.15, < 5.15.3
Redhat	3scale	2.0
Redhat	Virtualization Host	4.0
Fedoraproject	Fedora	34
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux For Real Time	7
Redhat	Enterprise Linux For Real Time For Nfv	7
Netapp	H300s Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H300e Firmware	All versions
Netapp	H500e Firmware	All versions
Netapp	H700e Firmware	All versions
Netapp	H410s Firmware	All versions
Netapp	H410c Firmware	All versions
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Oracle	Communications Cloud Native Core Binding Support Function	22.1.3
Oracle	Communications Cloud Native Core Network Exposure Function	22.1.1
Oracle	Communications Cloud Native Core Policy	22.2.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1999544Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
https://lore.kernel.org/lkml/20211115165435.133245729%40linuxfoundation.org/
https://security.netapp.com/advisory/ntap-20220318-0009/Third Party Advisory
https://www.debian.org/security/2022/dsa-5096Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/09/15/4Exploit, Mailing List, Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1999544Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
https://lore.kernel.org/lkml/20211115165435.133245729%40linuxfoundation.org/
https://security.netapp.com/advisory/ntap-20220318-0009/Third Party Advisory
https://www.debian.org/security/2022/dsa-5096Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/09/15/4Exploit, Mailing List, Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory

Timeline

Published: Feb 16, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3752?

How severe is CVE-2021-3752?

CVE-2021-3752 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3752?

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.

Are you affected by CVE-2021-3752?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST