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Fencer Vulns
high 7.0

CVE-2021-32399 json

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

published 2021-05-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19253

cvss
7.0
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

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

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 5.10.38-1

debian advisories DEBIAN-CVE-2021-32399

  • linux Ubuntu 18.04 LTS 4.15.0-151.157
  • linux Ubuntu 20.04 LTS 5.4.0-77.86
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1109.116
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1051.53
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1046.49
  • linux-gke Ubuntu 20.04 LTS 5.4.0-1046.48
  • linux-kvm Ubuntu 18.04 LTS 4.15.0-1097.99
  • linux-kvm Ubuntu 20.04 LTS 5.4.0-1041.42

ubuntu advisories UBUNTU-CVE-2021-32399

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • redhat-virtualization-host rhev hypervisor 4.4 4.4.7-20210715.1.el8_4
  • redhat-virtualization-host-image-update rhev hypervisor 4.4 4.4.7-20210715.1.el8_4
  • kernel RHEL 7 3.10.0-1160.41.1.el7
  • perf RHEL 7 3.10.0-1160.41.1.el7
  • bpftool RHEL 7 3.10.0-1160.41.1.el7
  • python-perf RHEL 7 3.10.0-1160.41.1.el7
  • kernel-kdump RHEL 7 3.10.0-1160.41.1.el7
  • kernel-tools RHEL 7 3.10.0-1160.41.1.el7

red hat advisories RHSA-2021:3725RHSA-2021:2736RHSA-2021:3327RHSA-2021:3522RHSA-2021:3320RHSA-2022:0157

  • kernel-rt SLE Micro 5.2, SLE Micro 5.1 5.3.18-150300.211.1
  • kernel-source-rt SLE Micro 5.2, SLE Micro 5.1 5.3.18-150300.211.1
  • kernel-64kb SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS, Enterprise Storage 7.1 5.3.18-150300.59.207.1
  • kernel-syms SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1
  • kernel-source SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1
  • kernel-default SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +5 more 5.3.18-150300.59.207.1
  • kernel-preempt SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1
  • kernel-obs-build SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 5.3.18-150300.59.207.1

suse advisories SUSE-SU-2025:01995-1SUSE-SU-2025:01982-1SUSE-SU-2021:2577-1SUSE-SU-2021:2451-1SUSE-SU-2021:2421-1SUSE-SU-2021:2406-1

  • kernel-64kb openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-syms openSUSE Leap 15.3 5.3.18-59.5.1
  • kernel-obs-qa openSUSE Leap 15.3 5.3.18-59.5.1
  • kernel-source openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-default openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-preempt openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-kvmsmall openSUSE Leap 15.3 5.3.18-59.5.2
  • kernel-zfcpdump openSUSE Leap 15.3 5.3.18-59.5.2

opensuse advisories openSUSE-SU-2021:1977-1openSUSE-SU-2021:1975-1openSUSE-SU-2021:0947-1openSUSE-SU-2021:0843-1

  • kernel Rocky Linux 8 4.18.0-305.10.2.el8_4

rocky linux advisories RLSA-2021:2714

  • kernel CBL-Mariner 2.0 5.10.78.1-1

azure linux advisories AZL-6560

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • linux Arch Linux 5.12.4.arch1-1
  • linux-zen Arch Linux 5.12.4.zen1-1
  • linux-hardened Arch Linux 5.11.21.hardened1-1
  • linux-lts Arch Linux 5.10.37-1

arch linux advisories AVG-1958AVG-1959AVG-1960AVG-1961

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32399 updated cvss 7.0

kernel: race condition for removal of the HCI controller

  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-305.10.2.el8_4, kernel-debuginfo-common-aarch64 4.18.0-305.10.2.el8_4, kernel-debuginfo-common-ppc64le 4.18.0-305.10.2.el8_4
    fixed: vendor fix RHSA-2021:2714
  • Red Hat CodeReady Linux Builder EUS (v. 8.1) kernel-debuginfo-common-x86_64 4.18.0-147.52.1.el8_1, kernel-debuginfo-common-aarch64 4.18.0-147.52.1.el8_1, kernel-debuginfo-common-ppc64le 4.18.0-147.52.1.el8_1
    fixed: vendor fix RHSA-2021:3173
  • Red Hat CodeReady Linux Builder EUS (v. 8.2) kernel-debuginfo-common-x86_64 4.18.0-193.64.1.el8_2, kernel-debuginfo-common-aarch64 4.18.0-193.64.1.el8_2, kernel-debuginfo-common-ppc64le 4.18.0-193.64.1.el8_2
    fixed: vendor fix RHSA-2021:3363
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-305.10.2.el8_4, kernel 4.18.0-305.10.2.el8_4, bpftool 4.18.0-305.10.2.el8_4, kpatch-patch-4_18_0-305 1-3.el8, kernel-core 4.18.0-305.10.2.el8_4, kernel-tools 4.18.0-305.10.2.el8_4, +18 more
    fixed: vendor fix RHSA-2021:2714
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) perf 4.18.0-147.52.1.el8_1, kernel 4.18.0-147.52.1.el8_1, bpftool 4.18.0-147.52.1.el8_1, kernel-core 4.18.0-147.52.1.el8_1, kernel-tools 4.18.0-147.52.1.el8_1, python3-perf 4.18.0-147.52.1.el8_1, +24 more
    fixed: vendor fix RHSA-2021:3173
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) perf 4.18.0-193.64.1.el8_2, kernel 4.18.0-193.64.1.el8_2, bpftool 4.18.0-193.64.1.el8_2, kernel-core 4.18.0-193.64.1.el8_2, kernel-tools 4.18.0-193.64.1.el8_2, python3-perf 4.18.0-193.64.1.el8_2, +26 more
    fixed: vendor fix RHSA-2021:3363
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.41.1.el7, kernel 3.10.0-1160.41.1.el7, bpftool 3.10.0-1160.41.1.el7, python-perf 3.10.0-1160.41.1.el7, kernel-tools 3.10.0-1160.41.1.el7, kernel-tools-libs 3.10.0-1160.41.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.41.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.41.1.el7
    fixed: vendor fix RHSA-2021:3327
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-trace 3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.41.1.rt56.1181.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-kvm 3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-trace 3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-debug-kvm 3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-trace-kvm 3.10.0-1160.41.1.rt56.1181.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.41.1.rt56.1181.el7
    fixed: vendor fix RHSA-2021:3328
show 28 more
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-core 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-modules 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-debug-core 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-debug-modules 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-modules-extra 4.18.0-305.10.2.rt7.83.el8_4, +2 more
    fixed: vendor fix RHSA-2021:2715
  • Red Hat Enterprise Linux Real Time EUS (v. 8.2) kernel-rt 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-core 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-modules 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-debug-core 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-debug-modules 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-modules-extra 4.18.0-193.64.1.rt13.115.el8_2, +2 more
    fixed: vendor fix RHSA-2021:3375
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-kvm 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-core 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-modules 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-debug-kvm 4.18.0-305.10.2.rt7.83.el8_4, kernel-rt-debug-core 4.18.0-305.10.2.rt7.83.el8_4, +4 more
    fixed: vendor fix RHSA-2021:2715
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) kernel-rt 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-kvm 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-core 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-modules 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-debug-kvm 4.18.0-193.64.1.rt13.115.el8_2, kernel-rt-debug-core 4.18.0-193.64.1.rt13.115.el8_2, +4 more
    fixed: vendor fix RHSA-2021:3375
  • Red Hat Enterprise Linux Server (v. 6 ELS) perf 2.6.32-754.43.1.el6, kernel 2.6.32-754.43.1.el6, kernel-kdump 2.6.32-754.43.1.el6, kernel-firmware 2.6.32-754.43.1.el6, kernel-abi-whitelists 2.6.32-754.43.1.el6, kernel-debuginfo-common-i686 2.6.32-754.43.1.el6, +2 more
    fixed: vendor fix RHSA-2022:0157
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.41.1.el7, kernel 3.10.0-1160.41.1.el7, bpftool 3.10.0-1160.41.1.el7, kpatch-patch-3_10_0-1160 1-8.el7, python-perf 3.10.0-1160.41.1.el7, kernel-kdump 3.10.0-1160.41.1.el7, +18 more
    fixed: vendor fix RHSA-2021:3327
  • Red Hat Enterprise Linux Server AUS (v. 7.2) perf 3.10.0-327.100.1.el7, kernel 3.10.0-327.100.1.el7, python-perf 3.10.0-327.100.1.el7, kernel-tools 3.10.0-327.100.1.el7, kernel-tools-libs 3.10.0-327.100.1.el7, kernel-abi-whitelists 3.10.0-327.100.1.el7, +1 more
    fixed: vendor fix RHSA-2021:3399
  • Red Hat Enterprise Linux Server AUS (v. 7.3) perf 3.10.0-514.92.1.el7, kernel 3.10.0-514.92.1.el7, python-perf 3.10.0-514.92.1.el7, kernel-tools 3.10.0-514.92.1.el7, kernel-tools-libs 3.10.0-514.92.1.el7, kernel-abi-whitelists 3.10.0-514.92.1.el7, +1 more
    fixed: vendor fix RHSA-2021:3321
  • Red Hat Enterprise Linux Server AUS (v. 7.4) perf 3.10.0-693.94.1.el7, kernel 3.10.0-693.94.1.el7, python-perf 3.10.0-693.94.1.el7, kernel-tools 3.10.0-693.94.1.el7, kernel-tools-libs 3.10.0-693.94.1.el7, kernel-abi-whitelists 3.10.0-693.94.1.el7, +1 more
    fixed: vendor fix RHSA-2021:3725
  • Red Hat Enterprise Linux Server AUS (v. 7.6) perf 3.10.0-957.80.1.el7, kernel 3.10.0-957.80.1.el7, bpftool 3.10.0-957.80.1.el7, python-perf 3.10.0-957.80.1.el7, kernel-tools 3.10.0-957.80.1.el7, kernel-tools-libs 3.10.0-957.80.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3320
  • Red Hat Enterprise Linux Server AUS (v. 7.7) perf 3.10.0-1062.56.1.el7, kernel 3.10.0-1062.56.1.el7, bpftool 3.10.0-1062.56.1.el7, python-perf 3.10.0-1062.56.1.el7, kernel-tools 3.10.0-1062.56.1.el7, kernel-tools-libs 3.10.0-1062.56.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3522
  • Red Hat Enterprise Linux Server E4S (v. 7.6) perf 3.10.0-957.80.1.el7, kernel 3.10.0-957.80.1.el7, python-perf 3.10.0-957.80.1.el7, kernel-tools 3.10.0-957.80.1.el7, kpatch-patch-3_10_0-957_61_1 1-5.el7, kpatch-patch-3_10_0-957_61_2 1-5.el7, +12 more
    fixed: vendor fix RHSA-2021:3320
  • Red Hat Enterprise Linux Server E4S (v. 7.7) perf 3.10.0-1062.56.1.el7, kernel 3.10.0-1062.56.1.el7, bpftool 3.10.0-1062.56.1.el7, python-perf 3.10.0-1062.56.1.el7, kernel-tools 3.10.0-1062.56.1.el7, kpatch-patch-3_10_0-1062_36_1 1-5.el7, +13 more
    fixed: vendor fix RHSA-2021:3522
  • Red Hat Enterprise Linux Server Optional (v. 6 ELS) python-perf 2.6.32-754.43.1.el6, kernel-debuginfo-common-i686 2.6.32-754.43.1.el6, kernel-debuginfo-common-s390x 2.6.32-754.43.1.el6, kernel-debuginfo-common-x86_64 2.6.32-754.43.1.el6
    fixed: vendor fix RHSA-2022:0157
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.41.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.41.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.41.1.el7
    fixed: vendor fix RHSA-2021:3327
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.2) kernel-debuginfo-common-x86_64 3.10.0-327.100.1.el7
    fixed: vendor fix RHSA-2021:3399
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) kernel-debuginfo-common-x86_64 3.10.0-514.92.1.el7
    fixed: vendor fix RHSA-2021:3321
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.94.1.el7
    fixed: vendor fix RHSA-2021:3725
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.80.1.el7
    fixed: vendor fix RHSA-2021:3320
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.56.1.el7
    fixed: vendor fix RHSA-2021:3522
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.80.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.80.1.el7
    fixed: vendor fix RHSA-2021:3320
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.56.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.56.1.el7
    fixed: vendor fix RHSA-2021:3522
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.6) kernel-debuginfo-common-x86_64 3.10.0-957.80.1.el7
    fixed: vendor fix RHSA-2021:3320
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.7) kernel-debuginfo-common-x86_64 3.10.0-1062.56.1.el7
    fixed: vendor fix RHSA-2021:3522
  • Red Hat Enterprise Linux Server TUS (v. 7.6) perf 3.10.0-957.80.1.el7, kernel 3.10.0-957.80.1.el7, bpftool 3.10.0-957.80.1.el7, python-perf 3.10.0-957.80.1.el7, kernel-tools 3.10.0-957.80.1.el7, kernel-tools-libs 3.10.0-957.80.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3320
  • Red Hat Enterprise Linux Server TUS (v. 7.7) perf 3.10.0-1062.56.1.el7, kernel 3.10.0-1062.56.1.el7, bpftool 3.10.0-1062.56.1.el7, python-perf 3.10.0-1062.56.1.el7, kernel-tools 3.10.0-1062.56.1.el7, kernel-tools-libs 3.10.0-1062.56.1.el7, +2 more
    fixed: vendor fix RHSA-2021:3522
  • Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.41.1.el7, kernel 3.10.0-1160.41.1.el7, bpftool 3.10.0-1160.41.1.el7, python-perf 3.10.0-1160.41.1.el7, kernel-tools 3.10.0-1160.41.1.el7, kernel-tools-libs 3.10.0-1160.41.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.41.1.el7
    fixed: vendor fix RHSA-2021:3327
  • Red Hat Virtualization 4 Hypervisor for RHEL 7 redhat-virtualization-host 4.3.18-20210903.0.el7_9, redhat-virtualization-host-image-update 4.3.18-20210903.0.el7_9
    fixed: vendor fix RHSA-2021:3477

2 more fixed, 4 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2021/05/11/2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.