CVE-2021-47211: ALSA: usb-audio: fix null pointer dereference on pointer cs_desc

Published Apr 10, 2024
·
Updated

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: fix null pointer dereference on pointer csdesc

The pointer csdesc return from sndusbfindclocksource could be null, so there is a potential null pointer dereference issue. Fix this by adding a null check before dereference.

Affected Software

123 affected componentsFixes available
Linux Linux kernel<5.15.5
ubuntu/linux*
ubuntu/linux-aws<4.4.0-1144.150
4.4.0-1144.150
ubuntu/linux-azure<4.15.0-1189.204~14.04.1
4.15.0-1189.204~14.04.1
ubuntu/linux-lts-xenial<4.4.0-269.303~14.04.1
4.4.0-269.303~14.04.1
ubuntu/linux<4.4.0-269.303
4.4.0-269.303
ubuntu/linux-aws<4.4.0-1182.197
4.4.0-1182.197
ubuntu/linux-aws-hwe<4.15.0-1181.194~16.04.1
4.15.0-1181.194~16.04.1
ubuntu/linux-azure<4.15.0-1189.204~16.04.1
4.15.0-1189.204~16.04.1
ubuntu/linux-gcp<4.15.0-1174.191~16.04.1
4.15.0-1174.191~16.04.1
ubuntu/linux-hwe<4.15.0-238.250~16.04.1
4.15.0-238.250~16.04.1
ubuntu/linux-kvm<4.4.0-1145.156
4.4.0-1145.156
ubuntu/linux-oracle<4.15.0-1143.154~16.04.1
4.15.0-1143.154~16.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1114.121
4.4.0-1114.121
ubuntu/linux-fips*
ubuntu/linux<4.15.0-238.250
4.15.0-238.250
ubuntu/linux-aws<4.15.0-1181.194
4.15.0-1181.194
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-aws-5.4<5.4.0-1147.157~18.04.1
5.4.0-1147.157~18.04.1
ubuntu/linux-azure*
ubuntu/linux-azure-4.15<4.15.0-1189.204
4.15.0-1189.204
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-5.4<5.4.0-1152.159~18.04.1
5.4.0-1152.159~18.04.1
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-4.15<4.15.0-1174.191
4.15.0-1174.191
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-5.4<5.4.0-1150.159~18.04.1
5.4.0-1150.159~18.04.1
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-5.4<5.4.0-218.238~18.04.1
5.4.0-218.238~18.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-ibm-5.4<5.4.0-1093.98~18.04.1
5.4.0-1093.98~18.04.1
ubuntu/linux-kvm<4.15.0-1164.169
4.15.0-1164.169
ubuntu/linux-oem*
ubuntu/linux-oracle<4.15.0-1143.154
4.15.0-1143.154
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-oracle-5.4<5.4.0-1145.155~18.04.1
5.4.0-1145.155~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1130.143~18.04.1
5.4.0-1130.143~18.04.1
ubuntu/linux-aws-fips<4.15.0-2119.125
4.15.0-2119.125
ubuntu/linux-azure-fips<4.15.0-2098.104
4.15.0-2098.104
ubuntu/linux-fips<4.15.0-1136.147
4.15.0-1136.147
ubuntu/linux-gcp-fips<4.15.0-2082.88
4.15.0-2082.88
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-218.238
5.4.0-218.238
ubuntu/linux-aws<5.4.0-1147.157
5.4.0-1147.157
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure<5.4.0-1152.159
5.4.0-1152.159
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-bluefield<5.4.0-1106.113
5.4.0-1106.113
ubuntu/linux-gcp<5.4.0-1150.159
5.4.0-1150.159
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-gkeop*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-ibm<5.4.0-1093.98
5.4.0-1093.98
ubuntu/linux-intel-5.13*
ubuntu/linux-iot<5.4.0-1051.54
5.4.0-1051.54
ubuntu/linux-kvm<5.4.0-1134.143
5.4.0-1134.143
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle<5.4.0-1145.155
5.4.0-1145.155
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi<5.4.0-1130.143
5.4.0-1130.143
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux-xilinx-zynqmp<5.4.0-1065.69
5.4.0-1065.69
ubuntu/linux-aws-fips<5.4.0-1147.157+fips1
5.4.0-1147.157+fips1
ubuntu/linux-azure-fips<5.4.0-1153.160+fips1
5.4.0-1153.160+fips1
ubuntu/linux-fips<5.4.0-1121.131
5.4.0-1121.131
ubuntu/linux-gcp-fips<5.4.0-1150.159+fips1
5.4.0-1150.159+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-nvidia-6.2*
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 4.4.0-1144.150
  2. Upgrade

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

    Fixed in 4.15.0-1189.204~14.04.1
  3. Upgrade

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

    Fixed in 4.4.0-269.303~14.04.1
  4. Upgrade

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

    Fixed in 4.4.0-269.303
  5. Upgrade

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

    Fixed in 4.4.0-1182.197
  6. Upgrade

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

    Fixed in 4.15.0-1181.194~16.04.1
  7. Upgrade

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

    Fixed in 4.15.0-1189.204~16.04.1
  8. Upgrade

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

    Fixed in 4.15.0-1174.191~16.04.1
  9. Upgrade

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

    Fixed in 4.15.0-238.250~16.04.1
  10. Upgrade

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

    Fixed in 4.4.0-1145.156
  11. Upgrade

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

    Fixed in 4.15.0-1143.154~16.04.1
  12. Upgrade

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

    Fixed in 4.4.0-1114.121
  13. Upgrade

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

    Fixed in 4.15.0-238.250
  14. Upgrade

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

    Fixed in 4.15.0-1181.194
  15. Upgrade

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

    Fixed in 5.4.0-1147.157~18.04.1
  16. Upgrade

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

    Fixed in 4.15.0-1189.204
  17. Upgrade

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

    Fixed in 5.4.0-1152.159~18.04.1
  18. Upgrade

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

    Fixed in 4.15.0-1174.191
  19. Upgrade

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

    Fixed in 5.4.0-1150.159~18.04.1
  20. Upgrade

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

    Fixed in 5.4.0-218.238~18.04.1
  21. Upgrade

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

    Fixed in 5.4.0-1093.98~18.04.1
  22. Upgrade

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

    Fixed in 4.15.0-1164.169
  23. Upgrade

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

    Fixed in 4.15.0-1143.154
  24. Upgrade

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

    Fixed in 5.4.0-1145.155~18.04.1
  25. Upgrade

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

    Fixed in 5.4.0-1130.143~18.04.1
  26. Upgrade

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

    Fixed in 4.15.0-2119.125
  27. Upgrade

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

    Fixed in 4.15.0-2098.104
  28. Upgrade

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

    Fixed in 4.15.0-1136.147
  29. Upgrade

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

    Fixed in 4.15.0-2082.88
  30. Upgrade

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

    Fixed in 5.4.0-218.238
  31. Upgrade

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

    Fixed in 5.4.0-1147.157
  32. Upgrade

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

    Fixed in 5.4.0-1152.159
  33. Upgrade

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

    Fixed in 5.4.0-1106.113
  34. Upgrade

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

    Fixed in 5.4.0-1150.159
  35. Upgrade

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

    Fixed in 5.4.0-1093.98
  36. Upgrade

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

    Fixed in 5.4.0-1051.54
  37. Upgrade

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

    Fixed in 5.4.0-1134.143
  38. Upgrade

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

    Fixed in 5.4.0-1145.155
  39. Upgrade

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

    Fixed in 5.4.0-1130.143
  40. Upgrade

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

    Fixed in 5.4.0-1065.69
  41. Upgrade

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

    Fixed in 5.4.0-1147.157+fips1
  42. Upgrade

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

    Fixed in 5.4.0-1153.160+fips1
  43. Upgrade

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

    Fixed in 5.4.0-1121.131
  44. Upgrade

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

    Fixed in 5.4.0-1150.159+fips1
  45. Compensating control

    Add a null check for the cs_desc pointer returned by snd_usb_find_clock_source before dereferencing it.

Event History

Apr 10, 2024
CVE Published
via MITRE·07:01 PM
Data Sourced
via MITRE·07:01 PM
Description
Data Sourced
via OSV·07:15 PM
DescriptionSeverityAffected Software
Event
via OSV·07:15 PM
Data Sourced
via NVD·07:15 PM
RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2021-47211?

The severity of CVE-2021-47211 is classified as medium due to the potential for a null pointer dereference.

2

How does CVE-2021-47211 affect the Linux kernel?

CVE-2021-47211 affects the Linux kernel by introducing a vulnerability in the ALSA usb-audio driver that can lead to a null pointer dereference.

3

How do I fix CVE-2021-47211?

To fix CVE-2021-47211, you should update your Linux kernel to version 5.15.5 or later.

4

What software versions are affected by CVE-2021-47211?

CVE-2021-47211 affects versions of the Linux kernel prior to version 5.15.5.

5

Is CVE-2021-47211 a remote exploit vulnerability?

CVE-2021-47211 is not classified as a remote exploit vulnerability, as it requires specific conditions related to the USB audio driver.

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