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CVE-2021-32399

HighPublished

net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI controller.

Published: May 10, 2021
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: Aug 8, 2026

Primary CVSS

7.0/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 51.0%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI controller.

Sources

linux-4.19.72_CVE-2021-32399PoC
Linux kernel 4.19.72 with a proof-of-concept exploit for CVE-2021-32399, demonstrating a use-after-free vulnerability in the netfilter subsystem for educational analysis.

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