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No exploitation reportedFix available

CVE-2021-3752

No exploitation reported by the sources we read.

  • Published2022-02-16
  • Fixed in5.15.3 · 5.14.19 · 5.10.80 · 5.4.160 · 4.19.218 · 4.14.256
  • WeaknessCWE-362 · CWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-02-1619:15CVE publishedNVD

Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
5.15≥ 5.15, < 5.15.35.15.3
5.x≥ 5.11, < 5.14.195.14.19
5.x≥ 5.5, < 5.10.805.10.80
5.4≥ 4.20, < 5.4.1605.4.160
4.x≥ 4.15, < 4.19.2184.19.218
4.x≥ 4.10, < 4.14.2564.14.256
4.x≥ 4.5, < 4.9.2914.9.291
4.4≥ 2.6.12, < 4.4.2934.4.293
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
10.0= 10.0no fix published
Redhat enterprise linux
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published

16 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • dtb-aarch64openSUSE:Leap 15.3all versions · fixed in 5.3.18-59.27.1and 11 other packages
  • kernelTuxCare:CentOS:8.5all versions · fixed in 4.18.0-348.7.1.el8_5.tuxcare.els4and 21 other packages
  • kernelRocky Linux:8all versions · fixed in 0:4.18.0-372.9.1.el8
  • kernelRed Hat:enterprise_linux:8::baseosall versions · fixed in 0:4.18.0-372.9.1.el8and 32 other packages
  • kernelRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:3.10.0-1160.59.1.el7and 18 other packages
  • kernelRed Hat:enterprise_linux:7::serverall versions · fixed in 0:3.10.0-1160.59.1.el7and 25 other packages
  • kernelRed Hat:enterprise_linux:7::clientall versions · fixed in 0:3.10.0-1160.59.1.el7and 18 other packages
  • kernelopenEuler:20.03-LTS-SP2all versions · fixed in 4.19.90-2110.3.0.0116.oe1

226 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-3752 Red Hat Product Security335 products fixed

    kernel: possible use-after-free in bluetooth module

  • RHSA-2022:1988 Red Hat Product Security120 products fixed

    Red Hat Security Advisory: kernel security, bug fix, and enhancement update

  • RHSA-2022:1975 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

  • RHSA-2022:0620 Red Hat Product Security155 products fixed

    Red Hat Security Advisory: kernel security and bug fix update

  • RHSA-2022:0622 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: kernel-rt security and bug fix update

Full record on NVD

Fix

  1. Update Linux linux kernel to 5.15.3 · 5.14.19 · 5.10.80 · 5.4.160 · 4.19.218 · 4.14.256 · 4.9.291 · 4.4.293
  2. Vendor fix Red Hat Product Security RHSA-2022:1988 · 120 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect.
  3. Workaround from the vendor Red Hat Product Security RHSA-2022:1988 · 120 productsMitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation baser or stability. The possible solution is to disable Bluetooth completely: https:/…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.1read 2026-10-23
  • NVDCVSS 2.07.9read 2026-10-23
  • CNAweakness (CWE)CWE-416known since 2026-10-23
  • NVDweakness (CWE)CWE-362read 2026-10-23
  • FIRST EPSSEPSS score1.7 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2022-02-16
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-3f53-58pp-pg79

Frequently asked questions

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.

Is CVE-2021-3752 actively exploited?

Active exploitation of CVE-2021-3752 has not been confirmed. Its EPSS score was 1.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3752?

CVE-2021-3752 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

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