CVE-2021-47670: can: peak_usb: fix use after free bugs

Published Apr 17, 2025
·
Updated

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

can: peakusb: fix use after free bugs

After calling peakusbnetifrxni(skb), dereferencing skb is unsafe. Especially, the canframe cf which aliases skb memory is accessed after the peakusbnetifrxni().

Reordering the lines solves the issue.

Affected Software

133 affected componentsFixes available
Linux Kernel
Linux Linux kernel>=4.0<4.19.171
Linux Linux kernel>=4.20<5.4.93
Linux Linux kernel>=5.5<5.10.11
Linux Linux kernel=5.11-rc1
Linux Linux kernel=5.11-rc2
Linux Linux kernel=5.11-rc3
Linux Linux kernel=5.11-rc4
ubuntu/linux-azure<4.15.0-1112.124~14.04.1
4.15.0-1112.124~14.04.1
ubuntu/linux-aws*
ubuntu/linux-lts-xenial*
ubuntu/linux-aws-hwe<4.15.0-1098.105~16.04.1
4.15.0-1098.105~16.04.1
ubuntu/linux-azure<4.15.0-1112.124~16.04.1
4.15.0-1112.124~16.04.1
ubuntu/linux-gcp<4.15.0-1097.110~16.04.1
4.15.0-1097.110~16.04.1
ubuntu/linux-hwe<4.15.0-142.146~16.04.1
4.15.0-142.146~16.04.1
ubuntu/linux-oracle<4.15.0-1069.77~16.04.1
4.15.0-1069.77~16.04.1
ubuntu/linux*
ubuntu/linux-aws*
ubuntu/linux-hwe-edge*
ubuntu/linux-kvm*
ubuntu/linux-fips*
ubuntu/linux-fips*
ubuntu/linux<4.15.0-141.145
4.15.0-141.145
ubuntu/linux-aws<4.15.0-1098.105
4.15.0-1098.105
ubuntu/linux-aws-5.4<5.4.0-1039.41~18.04.1
5.4.0-1039.41~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1112.125
4.15.0-1112.125
ubuntu/linux-azure-5.4<5.4.0-1041.43~18.04.1
5.4.0-1041.43~18.04.1
ubuntu/linux-gcp-4.15<4.15.0-1097.110
4.15.0-1097.110
ubuntu/linux-gcp-5.4<5.4.0-1038.41~18.04.1
5.4.0-1038.41~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-67.75~18.04.1
5.4.0-67.75~18.04.1
ubuntu/linux-kvm<4.15.0-1089.91
4.15.0-1089.91
ubuntu/linux-oracle<4.15.0-1069.77
4.15.0-1069.77
ubuntu/linux-oracle-5.4<5.4.0-1039.42~18.04.1
5.4.0-1039.42~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1030.33~18.04.1
5.4.0-1030.33~18.04.1
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-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2041.43
4.15.0-2041.43
ubuntu/linux-azure-fips<4.15.0-2024.27
4.15.0-2024.27
ubuntu/linux-fips<4.15.0-1057.65
4.15.0-1057.65
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-67.75
5.4.0-67.75
ubuntu/linux-aws<5.4.0-1039.41
5.4.0-1039.41
ubuntu/linux-azure<5.4.0-1041.43
5.4.0-1041.43
ubuntu/linux-gcp<5.4.0-1038.41
5.4.0-1038.41
ubuntu/linux-kvm<5.4.0-1034.35
5.4.0-1034.35
ubuntu/linux-oracle<5.4.0-1039.42
5.4.0-1039.42
ubuntu/linux-raspi<5.4.0-1030.33
5.4.0-1030.33
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
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-gkeop-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
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-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-gcp-fips*
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle-6.5*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 4.15.0-1112.124~14.04.1
  2. Upgrade

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

    Fixed in 4.15.0-1098.105~16.04.1
  3. Upgrade

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

    Fixed in 4.15.0-1112.124~16.04.1
  4. Upgrade

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

    Fixed in 4.15.0-1097.110~16.04.1
  5. Upgrade

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

    Fixed in 4.15.0-142.146~16.04.1
  6. Upgrade

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

    Fixed in 4.15.0-1069.77~16.04.1
  7. Upgrade

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

    Fixed in 4.15.0-141.145
  8. Upgrade

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

    Fixed in 4.15.0-1098.105
  9. Upgrade

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

    Fixed in 5.4.0-1039.41~18.04.1
  10. Upgrade

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

    Fixed in 4.15.0-1112.125
  11. Upgrade

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

    Fixed in 5.4.0-1041.43~18.04.1
  12. Upgrade

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

    Fixed in 4.15.0-1097.110
  13. Upgrade

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

    Fixed in 5.4.0-1038.41~18.04.1
  14. Upgrade

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

    Fixed in 5.4.0-67.75~18.04.1
  15. Upgrade

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

    Fixed in 4.15.0-1089.91
  16. Upgrade

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

    Fixed in 4.15.0-1069.77
  17. Upgrade

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

    Fixed in 5.4.0-1039.42~18.04.1
  18. Upgrade

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

    Fixed in 5.4.0-1030.33~18.04.1
  19. Upgrade

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

    Fixed in 4.15.0-2041.43
  20. Upgrade

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

    Fixed in 4.15.0-2024.27
  21. Upgrade

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

    Fixed in 4.15.0-1057.65
  22. Upgrade

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

    Fixed in 5.4.0-67.75
  23. Upgrade

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

    Fixed in 5.4.0-1039.41
  24. Upgrade

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

    Fixed in 5.4.0-1041.43
  25. Upgrade

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

    Fixed in 5.4.0-1038.41
  26. Upgrade

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

    Fixed in 5.4.0-1034.35
  27. Upgrade

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

    Fixed in 5.4.0-1039.42
  28. Upgrade

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

    Fixed in 5.4.0-1030.33
  29. Upgrade

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

    Fixed in 5.4.0-1069.73+fips2
  30. Upgrade

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

    Fixed in 5.4.0-1073.76+fips1
  31. Upgrade

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

    Fixed in 5.4.0-1067.71~20.04.1

Event History

Apr 17, 2025
CVE Published
via MITRE·06:01 PM
Data Sourced
via MITRE·06:01 PM
DescriptionSeverity
Data Sourced
via OSV·06:15 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·06:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Data Sourced
via Red Hat·07:01 PM
DescriptionSeverityAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2021-47670?

CVE-2021-47670 is classified as a high-severity vulnerability due to its potential to cause use-after-free errors in the Linux kernel.

2

How do I fix CVE-2021-47670?

To fix CVE-2021-47670, update your Linux kernel to the latest stable version where this vulnerability has been patched.

3

What systems are affected by CVE-2021-47670?

CVE-2021-47670 affects various versions of the Linux kernel that utilize the peak_usb driver.

4

What is the impact of CVE-2021-47670?

The impact of CVE-2021-47670 is that it can lead to kernel crashes or potentially allow unauthorized access to kernel memory.

5

How can I determine if CVE-2021-47670 affects my system?

To determine if CVE-2021-47670 affects your system, check your Linux kernel version against the list of affected versions provided by your distribution.

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