Description
A flaw double-free memory corruption in the Linux kernel HCI device initialization subsystem was found in the way user attach malicious HCI TTY Bluetooth device. A local user could use this flaw to crash the system. This flaw affects all the Linux kernel versions starting from 3.13.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | kernel | All Linux kernel versions starting from 3.13 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.10.46-1 | — |
| Debian 13 | linux | 5.10.46-1 | — |
| Debian 12 | linux | 5.10.46-1 | — |
| Debian 9 | linux | 4.9.272-1 | DLA-2689-1 |
| Debian 9 | linux-4.19 | 4.19.194-1~deb9u1 | DLA-2690-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-81.91 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1055.58 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-aws-5.11 +1 | 5.11.0-1016.17~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-aws-5.8 | 5.8.0-1042.44~20.04.1 | USN-5050-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1056.58 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-azure-5.11 | 5.11.0-1013.14~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure-5.8 | 5.8.0-1040.43~20.04.1 | USN-5050-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1019.22 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1051.55 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.11 | 5.11.0-1017.19~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.8 | 5.8.0-1039.41 | USN-5050-1 |
| Ubuntu 20.04 LTS | linux-gke | 5.4.0-1051.54 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1022.23 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.11 | 5.11.0-34.36~20.04.1 | USN-5046-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1045.47 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-oem-5.10 | 5.10.0-1038.40 | USN-5015-1 |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1053.57 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-oracle-5.8 | 5.8.0-1038.39~20.04.1 | USN-5050-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1042.46 | USN-5045-1 |
| Ubuntu 20.04 LTS | linux-riscv +4 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.11 | 5.11.0-1017.18~20.04.1 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-154.161 | USN-5044-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1110.117 | USN-5044-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1055.58~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1122.135 | USN-5044-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1056.58~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-dell300x | 4.15.0-1027.32 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1107.121 | USN-5044-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1051.55~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-gke-5.4 | 5.4.0-1051.54~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-gkeop-5.4 | 5.4.0-1022.23~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-81.91~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1098.100 | USN-5044-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1079.87 | USN-5044-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1053.57~18.04.1 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1042.46~18.04.3 | USN-5045-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1094.100 | USN-5044-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1111.120 | USN-5044-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1069.73+fips2 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1073.76+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1032.37 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1067.71~20.04.1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2052.54 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2034.38 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1068.77 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2017.19 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1069.75 | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1114.123~20.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-219.252 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1135.149 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1110.117~16.04.1 | USN-5044-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1122.135~16.04.1 | USN-5044-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1107.121~16.04.1 | USN-5044-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-154.161~16.04.1 | USN-5044-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1100.109 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1079.87~16.04.1 | USN-5044-1 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1099.104 | USN-5343-1, USN-5299-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1122.135~14.04.1 | USN-5044-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-219.252~14.04.1 | USN-5343-1, USN-5299-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-348.rt7.130.el8 | RHSA-2021:4140 |
| RHEL 8 | perf +26 | 4.18.0-348.el8 | RHSA-2021:4356 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1160.59.1.rt56.1200.el7 | RHSA-2022:0622 |
| RHEL 7 | perf +18 | 3.10.0-1160.59.1.el7 | RHSA-2022:0620 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | kernel-tools-libs-devel | 4.18.0-348.el8 | ALSA-2021:4356 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.88.1 | SUSE-SU-2022:0372-1 |
| SLES 12 SP5 | kernel-docs | 4.12.14-122.110.2 | SUSE-SU-2022:0364-1 |
| SLES 12 SP5 | kernel-syms +3 | 4.12.14-122.110.1 | SUSE-SU-2022:0364-1 |
| SLES 12 SP4 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.153.1 | SUSE-SU-2022:0362-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_42 | 1-4.3.1 | SUSE-SU-2022:0362-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.164.1 | SUSE-SU-2022:0477-1 |
| SLES for SAP 15 SP1 | kernel-docs +4 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.88.1 | SUSE-SU-2022:0372-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.110.1 | SUSE-SU-2022:0364-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.153.1 | SUSE-SU-2022:0362-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_42 | 1-4.3.1 | SUSE-SU-2022:0362-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.78.1 | SUSE-SU-2022:0555-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_28 | 1-3.3.1 | SUSE-SU-2022:0366-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_27 | 1-1.5.1 | SUSE-SU-2022:0367-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.110.1 | SUSE-SU-2022:0364-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_28 | 1-8.3.2 | SUSE-SU-2022:0364-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_24 | 1-6.5.1 | SUSE-SU-2022:0371-1 |
| SLE HPC 15 SP1 | kernel-docs +4 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.83.1 | SUSE-SU-2022:0367-1 |
| SUSE OpenStack Cloud Crowbar 9 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.153.1 | SUSE-SU-2022:0362-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_42 | 1-4.3.1 | SUSE-SU-2022:0362-1 |
| SUSE OpenStack Cloud 9 | kernel-syms +2 | 4.12.14-95.88.1 | SUSE-SU-2022:0371-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.153.1 | SUSE-SU-2022:0362-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_42 | 1-4.3.1 | SUSE-SU-2022:0362-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.153.1 | SUSE-SU-2022:0362-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_42 | 1-4.3.1 | SUSE-SU-2022:0362-1 |
| SUSE Enterprise Storage 6 | kernel-docs +4 | 4.12.14-197.105.1 | SUSE-SU-2022:0366-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | kernel-debug +4 | 4.12.14-197.105.1 | openSUSE-SU-2022:0366-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.238-182.421 | 1.0-0.amzn2 | ALAS2-2021-1685 |
| Amazon Linux 2 | perf +8 | 4.14.238-182.421.amzn2 | ALAS2-2021-1685 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | 6.6.35.1-4 | — |
| Azure Linux 2 (CBL-Mariner) | kernel | 5.10.78.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-348.el8 | ELSA-2021-4356 |
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.57.1.el7uek | ELSA-2021-9534, ELSA-2021-9485, ELSA-2021-9460 |
| Oracle Linux 7 | kernel-uek-container | 4.14.35-2047.507.7.5.el7 | ELSA-2021-9488, ELSA-2021-9458, ELSA-2021-9406 |
| Oracle Linux 7 | kernel-uek-container-debug | 5.4.17-2102.204.4.2.el8 | ELSA-2021-9406 |
| Oracle Linux 7 | kernel-uek-tools +3 | 4.14.35-2047.507.7.5.el7uek | ELSA-2021-9485, ELSA-2021-9460, ELSA-2021-9404 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.59.1.el7 | ELSA-2022-0620, ELSA-2021-9485, ELSA-2021-9460 |
Advisories 34
- ALSA-2021:4356 Moderate: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:4356 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- RHSA-2022:0622 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2022:0620 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2021:4140 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 14, 2026
- USN-5299-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5343-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5044-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5015-1 linux-oem-5.10 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-5046-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.11, linux-kvm, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-5050-1 linux-aws-5.8, linux-azure-5.8, linux-gcp-5.8, linux-oracle-5.8 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-5045-1 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2689-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2690-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2022:0364-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0555-1 Security update for the Linux RT Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0477-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0362-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0366-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0367-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0371-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0372-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2021-1685 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 2, 2025
- SUSE-SU-2022:0366-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-0064 Juniper Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 10, 2025
- ELSA-2022-0620 Important: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 23, 2022
- ELSA-2021-4356 Moderate: kernel security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
- ELSA-2021-9534 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 2, 2021
- ELSA-2021-9488 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 14, 2021
- ELSA-2021-9485 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 14, 2021
- ELSA-2021-9460 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 22, 2021
- ELSA-2021-9458 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 22, 2021
- ELSA-2021-9406 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 10, 2021
- ELSA-2021-9404 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 10, 2021
References
- [oss-security] 20210525 CVE-2021-3564 Linux Bluetooth device initialization implementation bug mailing-list
- [oss-security] 20210601 Re: CVE-2021-3564 Linux Bluetooth device initialization implementation bug mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=1964139
- https://www.openwall.com/lists/oss-security/2021/05/25/1
- [debian-lts-announce] 20210623 [SECURITY] [DLA 2689-1] linux security update mailing-list
- [debian-lts-announce] 20210623 [SECURITY] [DLA 2690-1] linux-4.19 security update mailing-list