CVE-2021-32399: Race Condition

Published May 10, 2021
·
Updated

A flaw was found in the Linux kernel’s handling of the removal of Bluetooth HCI controllers. This flaw allows an attacker with a local account to exploit a race condition, leading to corrupted memory and possible privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Other sources

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

Affected Software

137 affected componentsFixes available
redhat/kernel<0:2.6.32-754.43.1.el6
0:2.6.32-754.43.1.el6
redhat/kernel-rt<0:3.10.0-1160.41.1.rt56.1181.el7
0:3.10.0-1160.41.1.rt56.1181.el7
redhat/kernel<0:3.10.0-1160.41.1.el7
0:3.10.0-1160.41.1.el7
redhat/kernel<0:3.10.0-327.100.1.el7
0:3.10.0-327.100.1.el7
redhat/kernel<0:3.10.0-514.92.1.el7
0:3.10.0-514.92.1.el7
redhat/kernel<0:3.10.0-693.94.1.el7
0:3.10.0-693.94.1.el7
redhat/kernel<0:3.10.0-957.80.1.el7
0:3.10.0-957.80.1.el7
redhat/kernel<0:3.10.0-1062.56.1.el7
0:3.10.0-1062.56.1.el7
redhat/kernel-rt<0:4.18.0-305.10.2.rt7.83.el8_4
0:4.18.0-305.10.2.rt7.83.el8_4
redhat/kernel<0:4.18.0-305.10.2.el8_4
0:4.18.0-305.10.2.el8_4
redhat/kernel<0:4.18.0-147.52.1.el8_1
0:4.18.0-147.52.1.el8_1
redhat/kernel-rt<0:4.18.0-193.64.1.rt13.115.el8_2
0:4.18.0-193.64.1.rt13.115.el8_2
redhat/kernel<0:4.18.0-193.64.1.el8_2
0:4.18.0-193.64.1.el8_2
redhat/redhat-virtualization-host<0:4.3.18-20210903.0.el7_9
0:4.3.18-20210903.0.el7_9
redhat/redhat-virtualization-host<0:4.4.7-20210715.1.el8_4
0:4.4.7-20210715.1.el8_4
Linux Linux kernel<=5.12.2
Debian Debian Linux=9.0
NetApp Cloud Backup
All of the following
NetApp Solidfire Baseboard Management Controller Firmware
NetApp Solidfire Baseboard Management Controller
All of the following
NetApp H300s Firmware
NetApp H300s
All of the following
NetApp H500s Firmware
NetApp H500s
All of the following
NetApp H700s Firmware
NetApp H700s
All of the following
NetApp H300e Firmware
NetApp H300e
All of the following
NetApp H500e Firmware
NetApp H500e
All of the following
NetApp H700e Firmware
NetApp H700e
All of the following
NetApp H410s Firmware
NetApp H410s
NetApp Solidfire Baseboard Management Controller Firmware
NetApp Solidfire Baseboard Management Controller
NetApp H300s Firmware
NetApp H300s
NetApp H500s Firmware
NetApp H500s
NetApp H700s Firmware
NetApp H700s
NetApp H300e Firmware
NetApp H300e
NetApp H500e Firmware
NetApp H500e
NetApp H700e Firmware
NetApp H700e
NetApp H410s Firmware
NetApp H410s
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.25-16.12.27-1
ubuntu/linux-aws<4.4.0-1102.107
4.4.0-1102.107
ubuntu/linux-azure<4.15.0-1121.134~14.04.1
4.15.0-1121.134~14.04.1
ubuntu/linux-lts-xenial<4.4.0-222.255~14.04.1
4.4.0-222.255~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-222.255
4.4.0-222.255
ubuntu/linux-aws<4.4.0-1138.152
4.4.0-1138.152
ubuntu/linux-aws-hwe<4.15.0-1109.116~16.04.1
4.15.0-1109.116~16.04.1
ubuntu/linux-azure<4.15.0-1121.134~16.04.1
4.15.0-1121.134~16.04.1
ubuntu/linux-gcp<4.15.0-1106.120~16.04.1
4.15.0-1106.120~16.04.1
ubuntu/linux-hwe<4.15.0-151.157~16.04.1
4.15.0-151.157~16.04.1
ubuntu/linux-kvm<4.4.0-1103.112
4.4.0-1103.112
ubuntu/linux-oracle<4.15.0-1078.86~16.04.1
4.15.0-1078.86~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1072.78
4.4.0-1072.78
ubuntu/linux-fips*
ubuntu/linux<4.15.0-151.157
4.15.0-151.157
ubuntu/linux-aws<4.15.0-1109.116
4.15.0-1109.116
ubuntu/linux-aws-5.4<5.4.0-1051.53~18.04.1
5.4.0-1051.53~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1121.134
4.15.0-1121.134
ubuntu/linux-azure-5.4<5.4.0-1051.53~18.04.1
5.4.0-1051.53~18.04.1
ubuntu/linux-dell300x<4.15.0-1027.32
4.15.0-1027.32
ubuntu/linux-gcp-4.15<4.15.0-1106.120
4.15.0-1106.120
ubuntu/linux-gcp-5.4<5.4.0-1046.49~18.04.1
5.4.0-1046.49~18.04.1
ubuntu/linux-gke-5.4<5.4.0-1046.48~18.04.1
5.4.0-1046.48~18.04.1
ubuntu/linux-gkeop-5.4<5.4.0-1018.19~18.04.1
5.4.0-1018.19~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-77.86~18.04.1
5.4.0-77.86~18.04.1
ubuntu/linux-kvm<4.15.0-1097.99
4.15.0-1097.99
ubuntu/linux-oracle<4.15.0-1078.86
4.15.0-1078.86
ubuntu/linux-oracle-5.4<5.4.0-1048.52~18.04.1
5.4.0-1048.52~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1038.41~18.04.1
5.4.0-1038.41~18.04.1
ubuntu/linux-raspi2<4.15.0-1092.98
4.15.0-1092.98
ubuntu/linux-snapdragon<4.15.0-1109.118
4.15.0-1109.118
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-edge*
ubuntu/linux-gke-4.15*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2051.53
4.15.0-2051.53
ubuntu/linux-azure-fips<4.15.0-2033.37
4.15.0-2033.37
ubuntu/linux-fips<4.15.0-1066.75
4.15.0-1066.75
ubuntu/linux-gcp-fips<4.15.0-2016.18
4.15.0-2016.18
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-77.86
5.4.0-77.86
ubuntu/linux-aws<5.4.0-1051.53
5.4.0-1051.53
ubuntu/linux-aws-5.8<5.8.0-1041.43~20.04.1
5.8.0-1041.43~20.04.1
ubuntu/linux-azure<5.4.0-1051.53
5.4.0-1051.53
ubuntu/linux-azure-5.8<5.8.0-1039.42~20.04.1
5.8.0-1039.42~20.04.1
ubuntu/linux-bluefield<5.4.0-1013.16
5.4.0-1013.16
ubuntu/linux-gcp<5.4.0-1046.49
5.4.0-1046.49
ubuntu/linux-gcp-5.8<5.8.0-1038.40~20.04.1
5.8.0-1038.40~20.04.1
ubuntu/linux-gke<5.4.0-1046.48
5.4.0-1046.48
ubuntu/linux-gkeop<5.4.0-1018.19
5.4.0-1018.19
ubuntu/linux-hwe-5.8<5.8.0-63.71~20.04.1
5.8.0-63.71~20.04.1
ubuntu/linux-kvm<5.4.0-1041.42
5.4.0-1041.42
ubuntu/linux-oem-5.10<5.10.0-1032.33
5.10.0-1032.33
ubuntu/linux-oracle<5.4.0-1048.52
5.4.0-1048.52
ubuntu/linux-oracle-5.8<5.8.0-1037.38~20.04.1
5.8.0-1037.38~20.04.1
ubuntu/linux-raspi<5.4.0-1038.41
5.4.0-1038.41
ubuntu/linux-azure-fde-5.15<5.15.0-1114.123~20.04.1
5.15.0-1114.123~20.04.1
ubuntu/linux-oem-5.6*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.8*
ubuntu/linux-aws-fips<5.4.0-1069.73+fips2
5.4.0-1069.73+fips2
ubuntu/linux-azure-fips<5.4.0-1073.76+fips1
5.4.0-1073.76+fips1
ubuntu/linux-fips<5.4.0-1028.32
5.4.0-1028.32
ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1
5.4.0-1067.71~20.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-raspi-realtime*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-754.43.1.el6
  2. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.41.1.rt56.1181.el7
  3. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.41.1.el7
  4. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-327.100.1.el7
  5. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-514.92.1.el7
  6. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-693.94.1.el7
  7. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.80.1.el7
  8. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1062.56.1.el7
  9. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-305.10.2.rt7.83.el8_4
  10. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-305.10.2.el8_4
  11. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-147.52.1.el8_1
  12. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-193.64.1.rt13.115.el8_2
  13. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-193.64.1.el8_2
  14. Upgrade

    Upgrade redhat/redhat-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.3.18-20210903.0.el7_9
  15. Upgrade

    Upgrade redhat/redhat-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.4.7-20210715.1.el8_4
  16. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1
  17. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1102.107
  18. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1121.134~14.04.1
  19. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-222.255~14.04.1
  20. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-222.255
  21. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1138.152
  22. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1109.116~16.04.1
  23. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1121.134~16.04.1
  24. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1106.120~16.04.1
  25. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-151.157~16.04.1
  26. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1103.112
  27. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1078.86~16.04.1
  28. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1072.78
  29. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-151.157
  30. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1109.116
  31. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1051.53~18.04.1
  32. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1121.134
  33. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1051.53~18.04.1
  34. Upgrade

    Upgrade ubuntu/linux-dell300x to a version that resolves this vulnerability.

    Fixed in 4.15.0-1027.32
  35. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1106.120
  36. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1046.49~18.04.1
  37. Upgrade

    Upgrade ubuntu/linux-gke-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1046.48~18.04.1
  38. Upgrade

    Upgrade ubuntu/linux-gkeop-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1018.19~18.04.1
  39. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-77.86~18.04.1
  40. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1097.99
  41. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1078.86
  42. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1048.52~18.04.1
  43. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1038.41~18.04.1
  44. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1092.98
  45. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1109.118
  46. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2051.53
  47. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2033.37
  48. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1066.75
  49. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2016.18
  50. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-77.86
  51. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1051.53
  52. Upgrade

    Upgrade ubuntu/linux-aws-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-1041.43~20.04.1
  53. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1051.53
  54. Upgrade

    Upgrade ubuntu/linux-azure-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-1039.42~20.04.1
  55. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.4.0-1013.16
  56. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1046.49
  57. Upgrade

    Upgrade ubuntu/linux-gcp-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-1038.40~20.04.1
  58. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 5.4.0-1046.48
  59. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.4.0-1018.19
  60. Upgrade

    Upgrade ubuntu/linux-hwe-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-63.71~20.04.1
  61. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1041.42
  62. Upgrade

    Upgrade ubuntu/linux-oem-5.10 to a version that resolves this vulnerability.

    Fixed in 5.10.0-1032.33
  63. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1048.52
  64. Upgrade

    Upgrade ubuntu/linux-oracle-5.8 to a version that resolves this vulnerability.

    Fixed in 5.8.0-1037.38~20.04.1
  65. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1038.41
  66. Upgrade

    Upgrade ubuntu/linux-azure-fde-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1114.123~20.04.1
  67. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1069.73+fips2
  68. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1073.76+fips1
  69. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1028.32
  70. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1067.71~20.04.1
  71. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch e2cb6b891ad2b8caa9131e3be70f45243df82a80
  72. Configuration

    Disable Bluetooth by preventing its kernel modules from loading with system-wide modprobe rules; alternatively, disable Bluetooth in hardware or at the BIOS level.

    Linux kernel Bluetooth functionality Bluetooth kernel modules = disabled/blocklisted

Event History

May 10, 2021
CVE Published
via MITRE·09:19 PM
Data Sourced
via MITRE·09:19 PM
Description
Data Sourced
via OSV·10:15 PM
DescriptionSeverityAffected Software
Jun 11, 2021
Data Sourced
via Red Hat·09:22 AM
DescriptionSeverityAffected Software
Apr 1, 2022
Exploit Published
via GitHub·10:29 AM

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2021-32399?

CVE-2021-32399 is considered a medium severity vulnerability due to its potential for privilege escalation.

2

How do I fix CVE-2021-32399?

To fix CVE-2021-32399, upgrade to the recommended kernel versions specified by your distribution.

3

What systems are affected by CVE-2021-32399?

CVE-2021-32399 affects various versions of the Linux kernel and specific Red Hat packages.

4

Can CVE-2021-32399 be exploited remotely?

No, CVE-2021-32399 requires a local account for exploitation, limiting its attack surface.

5

What impact does CVE-2021-32399 have on systems?

CVE-2021-32399 can lead to memory corruption and potential privilege escalation, impacting system integrity.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203